Where to start? Well if you want a pair of lightweight, low bulk, waterproof over trousers then look no further. The Arc’teryx Beta AR pants are a beautiful example of what waterproof over trousers should be. Perfect for 4 season, all-round use in outdoor activities such as skiing, walking and mountaineering.
Looking at the construction you can see that Arcteryx have used two different fabrics in their complex hybrid panelling. The main bulk of the pants are made using N40r-X GORE-TEX® Pro 3L whilst the areas that take more battering, such as the seat, knees and lower legs, use a thicker denier N80p-X GORE-TEX® 3L fabric.
Breaking down the code:
N = Nylon / Number = Denier / r=ripstop, p = plain-weave / X= exceptional durability-to-weight ratio / GORE-TEX® Pro = Membrane / 3L= 3 Layer fabric
For added durability around the instep you get Schoeller Keprotec™ patches for reassuring protection against boot damage, crampons and skis. Made from high tensile aramide fibres, this stuff is designed to take a battering and will last for years. The elasitacted hems feature internal Cordura® Powdercuffs™ and a bootlace hooks for extra protection during snowy alpine days.
Arc’teryx pioneered the industry’s Watertight™ zippers which seal out the nasty weather, on the Beta AR Pants you will find these on the ¾ length side zips, pockets and fly. Arcteryx have used 3/4 length zips so that they don't interfere with a climbing harness or rucksack hipbelt whilst still allowing full and easy access. All the seams have a 1.6mm micro seam allowance and Tiny Gore® (16mm) seam tape in order to reduce bulk and weight whilst improving overall breathability; thinner seam tape equals less weight plus a larger area of breathable fabric.
The fit of these trousers come under the Arc’terx “Athletic Fit”design, which is basically their standard fit. The complex patterning of the Beta AR pants allows for an exceptional articulated fit, providing a great range of movement and means less bulk by eliminating any excess fabric. The Beta AR Pants should have enough room underneath for a lightweight midlayer. Finally for a secure fit around the waist Arc'teryx have included an integrated webbing belt for easy adjustment.
For exact measurements refer to the Link provided in the Sizing Information section.