Our ultra-soft and breathable base layer top, a lightweight blend of bamboo and merino wool for lodge lounging or under ski wear. Fit & Design: Slim fit T-Shirt Mock neck Lightweight blend Ultra-soft and breathable Technology: Thermo-regulating merino wool and soft bamboo blend Additional Details: Designed for -30deg F - 60deg F temperature range Machine wash cold inside out with like colors Do not bleach or use fabric softeners Lay flat to dry Do not iron