1.7mm thick -available in tan and black! Add rubber sole to any pair of t-straps, moccs or shoes or boots in size 3 (9months) 4.75” and bigger. Makes for a thicker longer lasting sole. For outdoor weather conditions. Leather on inside and waterproof sole on out side of shoes. thin flexible rubber outer sole for toddlers and kids. For early walkers choose little walker ( more slip proof and flexible)