20mm EVA foam lining provides shock absorption for optimal joint protection. Packed with a compact, clean rag fill. Crafted with Extra Heavy Duty, Laminated Ripstop Tarpaulin, featuring durable stitching & zipped lid w/ patent-pending REFILL LID for simple refilling. Top-notch AAA Grade, commercial-grade boxing bag backed by 2 year extended manufacturer warranty. Included are heavy-duty support hooks, tie-down point, extra heavy-duty chain and swivel, plus an additional tie-down point for extra stability.