From Passionata "Sofia" in cream and peach thongboy, 4077.35. (Sounds complicated but Passionata are very clever at designing underwear without too many seams). The exact material is composed of: 73% Polyamide 18%Polyester 9%Elastane and these thongboys may be machine washed at 30 degrees, use no bleach, do not dry clean, iron or tumble dry.