The simple peel-and-stick Sea to Summit sleeping mat Repair Kit has been specially formulated for a failsafe bond to our sleeping mat surface fabric. It includes four 3cm circular grey patches, four 4cm square grey patches, and two replacement silicone one-way valve flaps. This repair kit weighs only 10g. Be prepared to handle rips and tears in your sleep mat before you head out on the trail with the Sea to Summit Air Mattress Repair Kit.