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Arcteryx Mens Beta SL Pant Black


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The Beta SL pant from Arcteryx is a lightweight, protective waterproof shell trouser that combines two different Gore-Tex constructions to give you the optimum trouser for trekking and backpacking in the mountains. 


Versatile high performance designs for diverse activities and conditions.


Versatile: high performance for diverse activities and conditions.


Superlight materials and design, emphasizing light weight and packability over durablity.

Arcteryx Mens Beta SL Pant Black

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What is the Beta SL Pant?

The Beta SL pant from Arcteryx is a lightweight, protective waterproof shell trouser that combines two different Gore-Tex constructions to give you the optimum trouser for trekking and backpacking in the mountains.  It is loaded with all the features and impressive tech you'd expect from Arcteryx, yet is light and packable enough to be stashed in your rucksack all day just in case the weather changes.

What is the Beta SL made of?

It's incredible weight and pack size is predominantly down to the use of 2L Gore-tex Paclite Plus. Paclite Plus is incredibly comfortable, soft to the touch and doesn't stick to your skin when you get wet - I can confirm this, I tested it out in person. It's a 2 layer construction that not only offers great breathability but also the reliable durability of Gore-Tex in torrential downpours. These pants also feature 3-layer Gore-tex reinforcements in the high wear areas for extra durability and protection when scrambling or using crampons.

What are the features?

The Beta SL pants feature full-length side zippers which make the pants easy to throw on when the weather changes quickly, but also provide rapid ventilation when you start to work up a sweat. The trousers also have low profile external waist adjusters that don't rub or dig in under a hip belt or harness. Moving down, the trousers feature bottom hem lace hooks that accommodate hiking boots and low profile alpine boots. The instep of the trousers is reinforced to provide extra durability when scrambling or using crampons. 

How does the Beta SL fit?

The Beta SL Pants sit in Arcteryx's 'Regular fit' fit block which means that they will follow the shape of your legs without hugging them, offering excellent range of motion without being restrictive. They will also still be able to comfortably accommodate a layer or two underneath. 

Where do the Beta SL pants fit in the layering system?

The Beta SL Pants are primarily designed as an outer shell, more commonly referred to as a hard shell; which means it works well to protect you from strong winds on cold days, right up to torrential downpours.


The Beta SL Hybrid is an excellent piece for fast and light adventures in the mountains; whether the weather turns on a long scramble, or as an all-day piece in changeable, chilly conditions - the Beta SL will keep you protected. It also weighs next to nothing and packs down nice and small so you can stash it in your pack on those days when you're not really sure what the weather is going to do. 

  • Lightweight
  • Packable
  • Waterproof
  • Breathable
  • Regular Fit
  • 2L Gore-Tex Paclite Plus with 3L Gore-Tex reinforcements in high wear area
  • Full length side zippers
  • Low profile external waist adjusters
  • Bottom hem lace hooks
  • Reinforced instep patch
Code : 23145-BLA-

Season : 2020S R

Weight : 0KG

Sizing Information

Arc'teryx Men's Jackets & Shirts Sizing Information

Measurements refer to body size, not garment dimensions.

  Chest Waist Hip Sleeve
X-Small 36" 29" 36" 32"
Small 38" 31" 38" 33"
Medium 40" 33" 40" 34"
Large 43" 36" 43" 35"
X-Large 46" 39" 46" 36"
XX-Large 50" 43" 50" 37"
  Chest Waist Hip Sleeve
X-Small 92cm 74cm 92cm 81cm
Small 97cm 79cm 97cm 84cm
Medium 102cm 84cm 102cm 86cm
Large 110cm 94cm 110cm 89cm
X-Large 118cm 99cm 118cm 91cm
XX-Large 128cm 110cm 128cm 94cm

Next to Skin Fit: Cut snug to the body through the entire garment to enhance moisture management and thermal efficiency.

Slim Fit: Cut slim to the body through chest, waist, hip and thigh for a low profile fit.

Regular Fit: Cut comfortably from the body through bust/chest, waist, hip and thigh for a classic fit.

Relaxed Fit: Cut loosely through the waist, hip, and thigh for a casual fit.


Measure around your chest/bust, holding the measuring tape under your armpit.


Measure around your waist at the narrowest part.


From a standing position, measure from your crotch to your ankle.


With your arms in a slightly bent position, measure from the centre of the back of your neck, along the length of your arm, to the wrist.


Measure around your hips at the widest part.

Technical Information

Weight: 345g

Fabric: N40r Gore-Tex Paclite Plus with N150p Gore-Tex reinforcements in the high wear areas

Care & Advice

Care and maintenance

To keep your outdoor clothing and equipment in tip top condition and performing to its maximum we recommend the use of Nikwax products. We have been using Nikwax products since day one (26th March 1986) and have found them to be totally reliable, dependable and effective. Today’s Nikwax treatments contain environmentally friendly elastic water-repellent polymers that bond to fabric fibres, leaving the spaces between open and breathable. These stretchy polymers are able to stretch and move with the fabric so they stay put for longer and work better.

Nikwax treatments will not change the look or feel of the fabric and they are all water based, environmentally safe, non-flammable and contain no nasty Fluorocarbons. Nikwax products can be used to clean, re-proof and revitalise all your outdoor technical clothing and equipment.

Waterproof breathable clothing has a durable water-repellent (DWR) finish applied to the face fabric during the manufacturing process. The DWR forces water to bead up and roll off the surface therefore preventing the fabric from absorbing moisture. If the outside of your jacket is soaked in a layer of cold water, the warm damp air within can’t escape and will condense on the inside. This makes the jacket feel cold clammy and can make you think that it’s leaking. The DWR finish is not permanent and needs to be maintained and revitalised to optimise performance.

This three layer waterproof jacket should be cleaned regularly with Nikwax Tech Wash; I wash my jacket about once a month, or more often if it gets really filthy. Regular washing with Tech Wash will maintain the DWR for longer and remove salts and oils that can contaminate the fabric, and it will keep your lovely jacket clean and smelling fresh. Washing can be done in a machine according to the manufacturers care guidelines (on the internal label). First clean out any detergent and conditioner residue from the machine dispenser and then add the required amount of Tech Wash and away you go. Hand washing is also suitable but be sure to rinse the garment well.

When you notice that rain/water is no longer beading up and rolling off it’s time to re-proof. Nikwax TX Direct will re-instate a long lasting DWR to completely rejuvenate your jacket. Re-proofing can also be done in the machine once a garment has been washed. Just add the TX-Direct and use the same programme you used for washing. You can also use the spray-on product on a damp garment that has just been washed.

You wouldn’t buy a Ferrari and never have it serviced, so make sure you regularly wash and re-proof your quality kit.

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Arcteryx Mens Beta SL Pant Black

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Excellent customer service. Really detailed easy to understand product descriptions on the Trekitt website, and gear reviews on the Trekitt YouTube channel made it so easy to choose the right backpack for me.
Emily - May 2020
Amazing service! Very helpful in regards sizing and what most matched my needs, despite this being done over the internet. YouTube videos of products being examined are very useful also. Would definitely use again, very fast and efficient delivery. Brilliant! Highly recommended!
David R - April 2020
Highly recommend. I usually go to the shop in Hereford as staff are alwasy very helpful and knowledgeable. So this was the first time I have purchased online and the service was just as good as the shop.
Grizzy - April 2020


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