A technical synthetic baselayer for when details matter the Hot Chillys Micro-Elite Chamois Men's Crew has a second skin body fit for movement and efficient moisture management, flat seam construction and seams set off the shoulders for pack strap compatibility and (remember “details?”) thumbholes to facilitate gliding this smoothly without twisting or bunching into a midlayer. Made from a wicking and fast drying blend of polyester with plenty of spandex for stretch movement and infused with Bio-Silver Odor to inhibit the growth of odor causing bacteria, this four way stretch piece has a smooth knit face for gliding under other layers, a brushed interior for enhanced moisture management and trapping warm air next to your skin. A technical baselayer with a UPF 30 protection rating this was built for athletes who value performance during cold weather aerobic activities and want a piece that gives them uninhibited movement while creating a comfortable microclimate under their heavier layers. From cold weather runs to backcountry climbs these are designed to take on your biggest challenges and help you push through them.