











Arc'teryx Women's Kyanite Baselayer Crew Neck
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Warm stretch-fleece base layer made for cold days and mixed output.
Polartec®
Synthetic fleece textiles with stretch, warmth and air permeable properties. Offers durability.
Multi-Use
Versatile high performance designs for diverse activities and conditions.
Description
The Kyanites – our warmest base layer tops – are the choice for cold days and stop-and-start activities. On the move, the Polartec Power Stretch Pro fleece stretches for unrestricted freedom. During rest phases, or when it’s really cold out, the soft brushed interior traps heat to keep you warm. The fleece’s durable nylon outer has a smooth face for comfort under layers, and thumbholes hold the sleeves in place.
The Kyanite Base Layers were previously known as the Rho Heavyweight base layers.
Features & Specs
- Lightweight
- Cold weather comfort
- Warm and comfortable
- Cuff, hem, and collar are bound with durable Tanica™ stretch fabric
- Polartec® Power Stretch® Pro fleece combines a highly durable nylon face with a soft, comfortable, brushed polyester interior made with recycled content
- Thumbholes help keep sleeves down and make layering easy
- Raglan sleeve layers comfortably and improves freedom of movement
- Articulated patterning for unrestricted mobility
- Chest pocket with laminated zip
- Contains materials that meet the bluesign® criteria
- PFAS (Per- and polyfluoroalkyl substances) Compliant
Jacket/shirt sizing chart
XXS |
72 |
76 |
60 |
84 |
XS |
75 |
81 |
65 |
89 |
S |
77 |
86 |
70 |
94 |
M |
80 |
91 |
75 |
99 |
L |
81 |
99 |
83 |
107 |
XL |
83 |
109 |
93 |
117 |
XXL |
85 |
119 |
103 |
127 |
NOTE: Arc'teryx sizes are intended to fit the above body measurements. If your measurements are between sizes, select a larger size for a looser fit or a smaller size for a tighter fit.
Fit & Sizing

Fit: Fitted
Our trimmer fit is patterned to stay close to the body through the chest, waist, hip, and thigh. Its low profile eliminates bulk, moves with the body, and fits comfortably over first layers or under outer layers.
Materials & Care
- Body: Power Stretch PRO Nylon Jersey/Cationic Dyed Recycled Polyester Velour, 248gsm - 53% Polyester, 38% Nylon, 9% Elastane
- Origin of fabric: UNITED STATES
- Origin of dying: UNITED STATES
- May release plastic microfibres into the environment when washing
- Machine wash low
- Line dry
- Do not bleach
- Wash dark colours separately
- Do not dry clean
- Do not iron
- Do not use fabric softener

Earn [points_amount] when you buy this item.