INFLATE & MOUNT INTRUCTIONS of model BC1512 BikeCushion 15″w by 12″l. To add or delete air use the on board inflation straw and your breath to add or squeeze out air to delete air. Pull the valve tab out and unfold the valve flat. Insert the straw until it passes the folded area. Add or delete air in small increments until the right volume of air is achieved. Close the valve by slipping the tab through the tab slot. Grab the tab on the other side then pull until it’s in place. Proceed with the other tabs.