Our heaviest weight base layer boot-cut bottom in the Phase™ family, appropriate for cooler temperatures and high output activities. Featuring comfortable anatomical shaping and mid-level insulation, these super-wicking base layer bottoms are ideal for cold days in the alpine. Engineered for superior moisture management and rapid dry-times during stop-and-go activities, these form-fitting pants keep the user drier and more comfortable. Hybrid mapping of Phasic™ SV (in the body) and Phasic™ AR (in the panels) fabrics in addition to the flatlock construction and next-to-skin fit improves comfort, eliminates excess bulk and rapidly transfers moisture for efficient evaporation and improved temperature regulation and layering. Encapsulated silver-ion fibres provide durable and long-lasting odour control. Bootcut length has 22” inseam.
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Arc'teryx Fit Guide - Next to Skin Fit
These snugly-fitting garments are made with stretch fabrics to fit next to the skin to enhance moisture management and thermal efficiency. Used for base layers which integrate well with Expedition, Trim, Athletic and Relaxed Fit.
To find out how to calculate your body measurements, view our Sizing Charts:
Moisture wicking base layer for interval activities.
SV | Severe Weather
Employs the most durable materials for prolonged use and provides the most weather protection in the harshest weather conditions.
Full Feature List
Odour-control fabric treatment
Hydrophobic materials will not absorb water
Flatlock construction improves next-to-skin comfort
Anatomical shaping for fit and comfort
Waist & Belt Configuration
Comfort waistband with laminated, soft-brushed finish
Logos & Label Configuration
Inseam Length (cm)
54.5 cm inseam
Phasic™ SV—92% polyester, 8% polypropylene, UPF 50+, 150 g/m². Double knit textile with mechanical stretch composed of multidimensional polyester yarns that wick moisture laterally to dry quickly, plus polypropylene yarns that have silver-ion encapsulated into the fibre for long-lasting odour control. The interior fabric is a combination of polyester and polypropylene and slightly lofted for mid-level insulation, while the face is 100% polyester, smooth and durably pill resistant.
Phasic™ AR—87% polyester, 13% polypropylene, UPF 50+, 145 g/m². Double knit textile with mechanical stretch composed of multi-dimensional polyester yarns that wick moisture laterally to dry quickly, plus polypropylene yarns that have silver-ion encapsulated into the fibre for long-lasting odour control. The smooth outer face is durably pill resistant and a lightly lofted interior adds light insulation.