Air cushion that allows users to adjust the air pressure of the cushion. Provides comfort by distributing pressure on the buttocks. Adjust the air pressure appropriately to allow your buttocks to sink in. This distributes pressure on the buttocks, allowing you to maintain a stable sitting posture. The cover is waterproofed, and the back is non-slip. Air Cushion 80mm Thick Type ¥27,650 (Tax-exempt price) Thickness 80 x Width 400 x Depth 400mm Weight 670g - Color: Black - Cover Material: Nylon - Cushion Material: Polyester, Polyurethane - Waterproofing: Yes - Adjustment Function: Air volume adjustable Used a few times. Please refrain from bidding if you are concerned about the condition, as this is a used item.