Cymed Inc One-piece Colostomy Closed-end Pouch with Microskin® Adhesive Plain Barrier and MicroDerm™ Thin Washer 1-1/2" Opening, 8" L, Pre-cut, Opaque Cymed provides you with a variety of pouches for every type of ostomy. All are composed of Cryovak odor-proof material and have a waterproof comfort backing. Cymed pouches are latex free and are available in either clear or opaque. Two-Piece Pouches: the Cymed two-piece barrier has a flat pliable universal flange. Two-piece pouches attach to the flange with an adhesive seal. No hard plastic ring! Cymed two-piece pouches and barriers are interchangeable.