Our men's bamboo underwear uses only the finest luxury fabric it surpasses cotton for softness, with a natural sheen and silky hand feel comparable to silk, it is immediately noticeable the moment it touches your skin. Perfect all year round keeping you warm in winter and cool in summer. This underwear is perfect for sensitive skin, our fabric is more breathable and 40% more absorbent pulling more excess moisture and wicking away from the skin than the finest organic cotton. Our underwear retains its shape wash after wash and will continue to hug and move with your body time and time again.95% Viscose from Bamboo, 5% Lycra