Men&';s Burton Synthetic Lightweight Base Layer Crewneck The Men&';s Burton Synthetic Lightweight Base Layer Crewneck is a light, breathable first layer built for active days on the mountain. The 160gsm smooth stretch jersey has a slim fit with four-way stretch for unrestricted movement and easy layering under outerwear. HeiQ Smart Temp(TM) helps regulate body temperature as conditions and activity levels change, while HeiQ Fresh(TM) provides odor control. Quick-drying, moisture-wicking performance and hidden thumbholes help keep you comfortable throughout the day. Details Material: 91% polyester, 9% spandex Fabric: Lightweight 160gsm smooth jersey Fit: Slim fit designed for performance layering Stretch: Four-way stretch with Stretch 360Adeg for unrestricted mobility Temperature Regulation: HeiQ Smart Temp(TM) technology helps regulate body temperature Odor Control: HeiQ Fresh(TM) silver-free odor-control technology Performance: Quick-drying, highly breathable and moisture-wicking Seams: Chafe-free Softlock seams with double-needle stitching Thumbholes: Hidden thumbholes provide additional hand coverage Features: Woven logo and locker loop Sustainability: BluesignA(R) approved product Warranty: Limited Lifetime Warranty