Mpalm width: 8-9cm. Measuring tolerance 1cm is allowed due to elastic materials. The width of the palms is measured from the part of your hand between the thumb and the index finger to the base of the little finger. You had better measure your palms then choose a fittest size. The wetsuit gloves made of 3mm premium composite material of neoprene and nylon, eco-friendly, high-elastic, has a remarkable thermal insulation performance and a long life span. They can effectively slow down the hands temperature loss and protect your hands from hurting by some sharp objects. Note: These neoprene gloves glued and blind stitching can slow down water leaking into it and enhance its durability. Diving glove isnt a completely water-proof product, but a diving equipment to match wetsuits. Unavoidably water will come through the stitched seams inch by inch. With anti-slip design on palm to help increase friction while diving and heave design on the hand back to give you a flexible fit, fitting for diving, surfing snorkeling, swimming, beach, and other water sports, but not for fishing because the material of bumps is hard PU rubber. To ensure you're satisfied with our products, we offer a 30-DAY MONEY BACK GUARANTEE. If our wetsuit gloves damaged when you receive, we'll send you a new one at no cost. Product Description