Bundle with the matching top! Over forty years ago Terramar was the first company to introduce pure silk performance base layer products. Today, Thermasilk is still the standard for people wanting a natural and breathable garment that is extremely lightweight and will keep you warm, dry and comfortable in all your indoor and outdoor adventures. Low profile design fit great under regular clothes to many any environment warmer. Our Thermasilk long johns provides warmth without bulk and goes great with our Thermasilk Crew. FEATURES Natural Thermoregulation Technology keeps you warm and dry Ultra-lightweight with naturally breathable Stretch comfort waistband Rib trim for unrestricted movement. 29" inseam, ankle-length fit TECHNOLOGY Natural technology provides comfort through a wide range of temperatures UPF rated for sun protection Warmth without the bulk Natural Breathability allows you to warm up or cool down with ease Moisture Management moves moisture from the skin to keep you warm and dry FABRIC COMPOSITION AND CARE 100% Pointelle Filament Silk Machine Wash Cold. Dark Colors Separately. Tumble Dry Low. Do not Iron/Steam or Dry Clean. No Fabric Softener or Dryer Sheets.