TRK-350 Trike Cover. Made of medium-weight polyester, this is the only trike cover guaranteed to be 100% 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.