Self-Adhesive Sponge for Bags - Durable Stiffener & Reinforcement Pad for Handbags, Purses & Totes - Perfect for DIY Repair, Crafting & Strengthening Weak Areas

This is a common reinforcement for chrome-tanned leather bags. It is a bit like EVA and softer than EVA. It can alleviate the problem that reinforcement are prone to wrinkles after being turned over.