We help solve application challenges, answer material questions, and provide valuable technical advice. Have a question? Ask a Plastics Expert. Want to explore more resources? Check out our articles, material selection tools, and white papers and material guides. Advantages of Silicone Free OP-TEK® Flex Comfort Silicone Free EVA material that offers consistent wall thickness, and will not cold flow or discolor. Watch Video Seaming Characteristics of OP-TEK® Flex Comfort OP-TEK® Flex Comfort is an EVA sheet for inner liners with excellent seaming characteristics. Watch Video OP-TEK® Flex BiLam For Comfort and Aesthetics Laminated material with black outer layer offers added comfort and improved aesthetics for patients wearing carbon socket frames. Watch Video C-TEK® RW™ Demo - Fast Roller Wrap Change C-TEK® RW™. A proprietary adhesive-coated plastic film that acts as a disposable protective surface for metal wheels and rollers. Watch Video