These Thermasilk natural and breathable long johns are 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. 

• Natural Thermoregulation Technology keeps you warm and dry.
• UPF rated for sun protection.
• Ultra-lightweight with naturally breathable material.
• Stretch comfort waistband.
• Rib trim for unrestricted movement.
• Fabric Content: 100% Filament Silk Jersey.