Waterproof Silicone Wrist Seals. Hi-grade Silicone Hypoallergenic medical-grade silicone. 100% UV and ozone resistance. 100 % UV and Ozone resistant. Extremely stretchable. No latex allergy. No maintenance. Easy donning and doffing. Extremely fast mounting. Permanent Interior Glide Coating The inside of the seal is treated with a glide coating for easy donning Safety Ridge- The safety ridge ensures that the seal stays in place. Fits SI-TECH, Polar Bears and Viking.