{"id":3097,"date":"2022-10-04T12:13:02","date_gmt":"2022-10-04T11:13:02","guid":{"rendered":"https:\/\/blog.citrus-lime.com\/tkt\/?p=3097"},"modified":"2025-12-05T08:17:27","modified_gmt":"2025-12-05T08:17:27","slug":"what-is-fill-power","status":"publish","type":"post","link":"https:\/\/blog.citrus-lime.com\/tkt\/what-is-fill-power\/","title":{"rendered":"What is Fill Power?"},"content":{"rendered":"\n<div style=\"height:36px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Curious about what fill power really means and why it matters for your down gear? Wondering how fill power, fill weight, and product construction combine to affect warmth, weight, and packability? Let\u2019s unpack the essentials so you can make the best choice for your outdoor insulation needs.<\/p>\n\n\n\n<div style=\"height:37px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-oswald-font-family\" id=\"1-is-camping-with-kids-a-nightmare\" style=\"text-transform:uppercase\">In SHORT&#8230;<\/h2>\n\n\n<ul style=\"padding-left: 1.1em; text-align: left; --ub-list-item-icon-top: 3px;; --ub-list-item-icon-size: 0.9em; --ub-list-item-background-image: url('data:image\/svg+xml;utf8,&lt;svg xmlns=&quot;http:\/\/www.w3.org\/2000\/svg&quot; viewBox=&quot;0 0 256 512&quot;&gt;&lt;path fill=&quot;%23000000&quot; d=&quot;M160 64c0-11.8-6.5-22.6-16.9-28.2s-23-5-32.9 1.6l-96 64C-.5 111.2-4.4 131 5.4 145.8s29.7 18.7 44.4 8.9L96 123.8V416H32c-17.7 0-32 14.3-32 32s14.3 32 32 32h96 96c17.7 0 32-14.3 32-32s-14.3-32-32-32H160V64z&quot;&gt;&lt;\/path&gt;&lt;\/svg&gt;'); --ub-list-item-fa-li-top: 3px; --ub-list-item-spacing: 0px; \" class=\"wp-block-ub-styled-list ub_styled_list\" id=\"ub_styled_list-a4ed379e-91a9-4987-93be-839ccbca8854\"><div class=\"ub-block-list__layout\" style=\"text-align: left; column-count: 1; --ub-list-mobile-column-count: 1; \">\n<li class=\"ub_styled_list_item\" style=\"--ub-list-item-icon-top: 3px; --ub-list-item-icon-size: 0.9em; --ub-list-item-background-image: url('data:image\/svg+xml;utf8,&lt;svg xmlns=&quot;http:\/\/www.w3.org\/2000\/svg&quot; viewBox=&quot;0 0 512 512&quot;&gt;&lt;path fill=&quot;%23000000&quot; d=&quot;M0 256a256 256 0 1 0 512 0A256 256 0 1 0 0 256zM241 377c-9.4 9.4-24.6 9.4-33.9 0s-9.4-24.6 0-33.9l87-87-87-87c-9.4-9.4-9.4-24.6 0-33.9s24.6-9.4 33.9 0L345 239c9.4 9.4 9.4 24.6 0 33.9L241 377z&quot;&gt;&lt;\/path&gt;&lt;\/svg&gt;'); \" id=\"ub-styled-list-item-d6f5b555-1b21-4dca-aa5a-6622ecdeae93\">\n\t\t\t<div class=\"ub_list_item_content\">\n\t\t\t\t<span class=\"ub_list_item_icon\">\n\t\t\t\t\t<svg width=\"0.9em\" height=\"0.9em\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 512 512\"><path fill=\"#000000\" d=\"M0 256a256 256 0 1 0 512 0A256 256 0 1 0 0 256zM241 377c-9.4 9.4-24.6 9.4-33.9 0s-9.4-24.6 0-33.9l87-87-87-87c-9.4-9.4-9.4-24.6 0-33.9s24.6-9.4 33.9 0L345 239c9.4 9.4 9.4 24.6 0 33.9L241 377z\"><\/path><\/svg>\n\t\t\t\t<\/span>\n\t\t\t\t<span class=\"ub_list_item_text\"><strong>What exactly is fill power and how does it reflect down quality?<\/strong> Understand what those numbers really mean for loft and warmth.<\/span>\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/li>\n\n<li class=\"ub_styled_list_item\" style=\"--ub-list-item-icon-top: 3px; --ub-list-item-icon-size: 0.9em; --ub-list-item-background-image: url('data:image\/svg+xml;utf8,&lt;svg xmlns=&quot;http:\/\/www.w3.org\/2000\/svg&quot; viewBox=&quot;0 0 512 512&quot;&gt;&lt;path fill=&quot;%23000000&quot; d=&quot;M0 256a256 256 0 1 0 512 0A256 256 0 1 0 0 256zM241 377c-9.4 9.4-24.6 9.4-33.9 0s-9.4-24.6 0-33.9l87-87-87-87c-9.4-9.4-9.4-24.6 0-33.9s24.6-9.4 33.9 0L345 239c9.4 9.4 9.4 24.6 0 33.9L241 377z&quot;&gt;&lt;\/path&gt;&lt;\/svg&gt;'); \" id=\"ub-styled-list-item-3501991f-eb5c-4df3-91e7-40e6c810de77\">\n\t\t\t<div class=\"ub_list_item_content\">\n\t\t\t\t<span class=\"ub_list_item_icon\">\n\t\t\t\t\t<svg width=\"0.9em\" height=\"0.9em\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 512 512\"><path fill=\"#000000\" d=\"M0 256a256 256 0 1 0 512 0A256 256 0 1 0 0 256zM241 377c-9.4 9.4-24.6 9.4-33.9 0s-9.4-24.6 0-33.9l87-87-87-87c-9.4-9.4-9.4-24.6 0-33.9s24.6-9.4 33.9 0L345 239c9.4 9.4 9.4 24.6 0 33.9L241 377z\"><\/path><\/svg>\n\t\t\t\t<\/span>\n\t\t\t\t<span class=\"ub_list_item_text\"><strong>How does fill weight impact the overall insulation and comfort?<\/strong> Learn why the amount of down inside is just as important as its fill power.<\/span>\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/li>\n\n<li class=\"ub_styled_list_item\" style=\"--ub-list-item-icon-top: 3px; --ub-list-item-icon-size: 0.9em; --ub-list-item-background-image: url('data:image\/svg+xml;utf8,&lt;svg xmlns=&quot;http:\/\/www.w3.org\/2000\/svg&quot; viewBox=&quot;0 0 512 512&quot;&gt;&lt;path fill=&quot;%23000000&quot; d=&quot;M0 256a256 256 0 1 0 512 0A256 256 0 1 0 0 256zM241 377c-9.4 9.4-24.6 9.4-33.9 0s-9.4-24.6 0-33.9l87-87-87-87c-9.4-9.4-9.4-24.6 0-33.9s24.6-9.4 33.9 0L345 239c9.4 9.4 9.4 24.6 0 33.9L241 377z&quot;&gt;&lt;\/path&gt;&lt;\/svg&gt;'); \" id=\"ub-styled-list-item-440cb0bb-6307-4df0-8cc2-100c1fb8e84e\">\n\t\t\t<div class=\"ub_list_item_content\">\n\t\t\t\t<span class=\"ub_list_item_icon\">\n\t\t\t\t\t<svg width=\"0.9em\" height=\"0.9em\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 512 512\"><path fill=\"#000000\" d=\"M0 256a256 256 0 1 0 512 0A256 256 0 1 0 0 256zM241 377c-9.4 9.4-24.6 9.4-33.9 0s-9.4-24.6 0-33.9l87-87-87-87c-9.4-9.4-9.4-24.6 0-33.9s24.6-9.4 33.9 0L345 239c9.4 9.4 9.4 24.6 0 33.9L241 377z\"><\/path><\/svg>\n\t\t\t\t<\/span>\n\t\t\t\t<span class=\"ub_list_item_text\"><strong>Why is the construction of down products critical?<\/strong> Discover how design influences insulation effectiveness and durability.<\/span>\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/li>\n<\/div><\/ul>\n\n\n<div style=\"height:37px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<h2>\u00a0<\/h2>\n<p>I imagine you\u2019ve arrived on this page because you\u2019re wondering, &#8220;what is fill power?&#8221;. You also looking to <a href=\"https:\/\/www.trekitt.co.uk\/outdoor-jackets\/insulated-jackets\">purchase a jacket<\/a>, sleeping bag, or down-insulated product. You may have come across the term \u2018fill power\u2019, followed by a seemingly arbitrary number. We\u2019re here to explain what this number represents. Additionally, we explain why you should be paying attention to it before purchasing your new shiny piece of kit.<\/p>\n<h1>What is fill power?<\/h1>\n<p>It is a standard measurement of the quality of down insulation and references how well that down will resist compression and retain expansion, or \u2018loft\u2019. The higher the number the greater the\u00a0loft.\u00a0The greater the loft, the higher the quality, basically. That is a hugely simplified, ultra-quick answer for those that just popped over here for that info.\u00a0It\u2019s worth reading on, though, as the below will explain what the specific numbers mean and how they\u2019re calculated.<\/p>\n<h3>What is down?<\/h3>\n<p>Natural down is made up of super lightweight and fluffy little clusters of, what are essentially, superfine feathers. Each down cluster is made up of plumules which are like hairy little arms. All those fine little plumules trap the warm air that a body produces. The finer the clusters and the finer the plumules, the more air will be trapped.\u00a0Down only works when it is able to expand, or \u2018loft\u2019. All those little plumules need to be able to waft around and trap the warm air; if they\u2019re compressed (or wet) they are far less effective.<br \/><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone\" src=\"https:\/\/blog.citrus-lime.com\/tkt\/wp-content\/uploads\/sites\/18\/2022\/10\/jack-blueberry-FvGOYbxO76M-unsplash-1-scaled.jpg\" alt=\"down fill power\" width=\"2560\" height=\"1440\" \/><\/p>\n<h2>The Science Behind Fill Power<\/h2>\n<p>\u2018Fill power\u2019 is represented by a number; usually 500, 600, 700 and so on.<br \/>The highest we&#8217;ve seen is 1000 fill power.<br \/>These numbers represent how much volume 1oz (or 28.4g) of down will expand, or loft, into.<br \/>The amount of volume is indicated by those numbers, so 500 = 500 cubic inches.<br \/>There are two tests that measure fill power: the European and the US tests.<br \/>In the UK we have widely adopted the US test and for simplicity, I\u2019ll stick with that one too.<br \/>The test itself involves placing precisely 1oz (28.4g) of conditioned down in a cylinder that is 290mm in diameter x 500mm in height. The down is then compressed from above with a flat object, or plate mass, weighing\u00a03.3245709\u00a0oz (94.25g).\u00a0The down volume is then measured and assigned a corresponding fill power.<\/p>\n<p>And that\u2019s about it really. The higher the number, the greater the loft and this also indicates the quality of the clusters. Only the finest, fluffiest, lightest clusters will produce those high numbers. So, you may be thinking that a 1000-fill power jacket will\u00a0<em style=\"font-size: 18px;font-weight: var(--DTFontWeight_Base);letter-spacing: 0px\">obviously<\/em> be warmer than a 500-fill power jacket. That\u2019d be too simple&#8230;<\/p>\n<h3>The higher the fill wait the warmer it will be<\/h3>\n<p>Fill power indicates the quality, but the physical amount of the down in the garment will play just as big a role.\u00a0This is usually referred to as \u2018fill weight\u2019.\u00a0Fill weight is defined by the total amount of down placed in a product. It is usually measured in grams. Very generally speaking, the higher the fill weight of a product, the warmer it will be.<\/p>\n<p><img decoding=\"async\" class=\"alignnone\" src=\"https:\/\/blog.citrus-lime.com\/tkt\/wp-content\/uploads\/sites\/18\/2022\/10\/fill-power-scaled.jpg\" alt=\"fill power vs fill weight\" width=\"2560\" height=\"1440\" \/><\/p>\n<h2>Baffles: The Art and Science of Down Product Construction<\/h2>\n<p>Construction of the product is also just as important because, down needs to &#8216;loft&#8217; to be effective. It needs empty space to expand into freely. A badly constructed product will have baffles (structures that contain the down) that restrict the down and make it less effective. The construction of the baffles in a product is a mixture of art and science. It is a subject much too big to cover here. &#8211; We have a team of experts who carefully inspect all our products. Our experts wear lab coats and use pencils to scrutinize every detail. They pay attention to every aspect of the product, including the size of the baffles and amount of down. They ensure that the down is not restricted, making the product more effective. You can trust that we only stock well-constructed products.<\/p>\n<h2>A Real-Life Comparison<\/h2>\n<p>We would like to conclude with a real-life example. A 1000 fill power jacket with 150g of down in stitch through baffles will, theoretically, offer the same warmth as a 500 fill power jacket with 300g of down in stitch through baffles. The 1000 fill power jacket will be much lighter and will compress down far smaller. That&#8217;s because it requires less down to achieve the same warmth, but consequently might cost twice as much. The 500 fill power jacket will be heavier and bulkier, but will offer more &#8216;cosiness&#8217; and will cost significantly less.<\/p>\n<p>As always, the trick is to get the product that suits your intended use. If you\u2019re a weight-conscious alpinist who needs the absolute pinnacle of performance for the least weight and pack size.\u00a0 You should be looking for products with a high fill power and a low fill weight. But if you\u2019re just an everyday hill plodder, you\u2019ll be just fine with a mid-level fill power and sensible fill weight.<\/p>\n<p>Are you curious about the <a href=\"https:\/\/www.trekitt.co.uk\/blog\/softshell-vs-hardshell\/\"><strong>differences between softshells and hardshells?<\/strong><\/a> Learn from the experts and make the most of your outdoor gear.<\/p>\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Curious about what fill power really means and why it matters for your down gear? Wondering how fill power, fill weight, and product construction combine to affect warmth, weight, and packability? Let\u2019s unpack the essentials so you can make the best choice for your outdoor insulation needs. In SHORT&#8230; \u00a0 I imagine you\u2019ve arrived on [&hellip;]<\/p>\n","protected":false},"author":74,"featured_media":6017,"comment_status":"open","ping_status":"open","sticky":false,"template":"single-full","format":"standard","meta":{"_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"footnotes":""},"categories":[98],"tags":[],"class_list":["post-3097","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-kniowledge"],"featured_image_src":"https:\/\/blog.citrus-lime.com\/tkt\/wp-content\/uploads\/sites\/18\/2022\/10\/Blog-Template-scaled.jpg","author_info":{"display_name":"Lorna Preston","author_link":"https:\/\/blog.citrus-lime.com\/tkt\/author\/lornapreston\/"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is Fill Power? - Trekitt Blog<\/title>\n<meta name=\"description\" content=\"Fill power is used to measure the loft, or &#039;fluffiness&#039; of the down inside outdoor products. 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