Shop for EVA Copolymer Sheets with Lubricant. Proflex with silicone (Proflex-S) and OP-TEK® Flex Comfort. EVA copolymer sheets with lubricant are soft, flexible EVA copolymers with an additive that gives the material a softer feel. The additive greatly reduces friction when patients don and doff prosthetic devices. EVA comes in several colors. Custom cuts and cut-to-size pieces. Stocked materials typically ship in 2-5 business days. Can’t find what you need? Get a quote.