Aquafleece has a Polyurethane coating on the outside for water resistance, durability and flexibility combined with a fleece inner layer to keep you snug and warm - a combination that works well when wet or dry. PolyPro is a combination of Spandex and polypropylene offering a perfect material for use around water as its has a brushed 'fleece like' inside to provide good thermal and wicking properties, whilst it also remains remarkably dry since the polypropylene material hates water.