Product Information Our Pain Checker socks are made using our patented carbon Bio-Electric Carbon Technology, to help you kiss pain and blood flow issues goodbye! Our patented carbon technology absorbs your body’s electrical impulses and sends pain-blocking signals to your brain while improving blood circulation and reducing pain. Perfect for users suffering from conditions like arthritis, poor circulation, and other foot problems. A true upgrade from your regular socks! Other benefits of our products include: No Slip Bottoms Low-profile seams for reduced irritation Additional padding in high-stress areas of the foot Acrylic, Lycra, and Carbon Made in the USA Machine Wash/Dry, Do Not Use Softeners Product Sizing SLIPPER SOCKS SIZING S — Men's Shoe Size 7-9.5 or Women's Shoe Size 8-10 1/2 L — Men's Shoe Size 10-12.5 or Women's Shoe Size 11-13 1/2