TRK-350 Trike Cover. Made of medium-weight polyester this is the only trike cover guaranteed to be 10% waterproof. All seams are electronically heat sealed with silver heat resistant lower panels. Perma Venting system prevents condensation buildup by allowing constant air circulation. 50″ rear zipper snug fitting elasticized bottom has 1″ grommets in center and at front wheel. folds into its own carryall. One size fits all.