If you have a foam mat, of course the easiest way to fix it is with duct tape.
For Inflatable Pads
Clean and dry area to be repaired. Apply Seam Grip to cover the hole and spread 1.25 inches (5mm) beyond. Allow to dry level overnight.
To speed the cure time, mix a few drops of water into Seam Grip before applying to the hole. Seam Grip cures faster when it is wet (use patch backing for mixing). Apply mixture and allow to cure level for 30 minutes (It will be fully cured in 2 hours). Note: Mixing Seam Grip with water will make repair cloudy. For a clear repair, mix with Cotol-240.
To use the repaired pad at once, center the Clean Tape peel-and-stick Patch and apply over uncured Seam Grip. The patch must extend at least 1.5 inches (10mm) beyond the Seam Grip. Press patch firmly onto pad. Your sleeping pad is ready for use! Allow the peel-and-stick. patch to remain for 3 to 4 days, then remove. The Seam Grip will have permanently sealed the hole underneath.