Adhesive patches: self-adhesive and waterproof, 10 x 20 cm in 12 colours" For repairing holes and tears or for customising sports and rainwear, umbrellas, tarpaulins etc. A worn area can be repaired quickly and easily. Cut out a suitable piece from the 10 x 20 cm patch, remove the protective film from the patch and stick it to the cleaned, grease-free and dry area. That's all there is to it! The adhesive patches are made from 100% polyester.