Icebreaker39s corespun fabric uses merino wool fibres wrapped around a nylon core for added durability and strength while maintaining next to skin softness with an added a touch of lycra174 to provide just enough stretch to withstand holding shape throughout your adventure of choice the unique flatlock stitching design features no side seams and no crotch seams making for the ultimate in chafe free comfort the wrapped satin jacquard waist makes for clean and comfortable style the fu