Wheelchair Tube 25" x 1" (20/23/25-559) Presta Valve

My Stimulite cushion has been perfectly fitted and durable for years. Perfectly designed accessible zippered pocket has been indispensable, but I hope this replacement I am ordering has a more durable zipper. Adding a little flap both above and below the zipper on the sides of the cover to help protect from wear whenever the tire happens rub against it would also help. Both the cushion and cover should have had more durable model numbers for easy reordering. But Sportaid, lease add explanation to your order form why I can't order my replacement without answering: "Cover Type: standard, sensitive" or "no cover"; this makes little sense.