Godsen Men's Thermal Underwear Length Bottom with Moisture Wicking 95% Cotton / 5% Spandex jersey 180g/m2 Water temperature does not exceed 30 , not chlorine bleaching, ironing highest temperature 110 , not dry, not wring, hang dry Rated for Extreme Cold Tempreatures Convenient Fly front Pull On closure Comfort Waistband and Gussets Thermachoice system: Cold to Very Cold Weather/Low to Medium Activity