From Birkenstock, the Men's Cotton Twist Sock features: This casual & soft, skin friendly cotton sock is perfect to be worn with sandals, clogs or shoes! The reinforced toe and heel sections offer lasting comfort by boosting durability and providing the feet with optimum protection. High cotton content for maximum comfort Original Birkenstock logo on the shaft Components: 96% cotton, 2% acrylic, 2% elastane Sizing M-9-11.5 and L-12-14.5 Imported.