Wall Bags are constructed with a heavy-duty 16 gauge vinyl. Helps keep your cover in place even during periods of high wind. Use one bag every 2-3 feet. Wall Bags are designed to lay on top of your winter cover around the inside edge of the pool to secure it in place. Each bag has reinforced holes to tie the bags and allow them to hang inside on the pool wall. Conveniently placed, leak-proof valve that is easy to fill with a garden hose.
Robelle 3803-12 Deluxe Wall Bags for Above Ground Winter Pool Covers 12-Pack - B00P8EH8N0