Pedag Summer is a flat insole made of soft cotton terry. Summer has a lightly padded, grooved, and perforated latex bottom for a non-slip surface that allows air to circulate inside the shoe. Summer is a hygienic option because it is hand washable and air dry. Summer is a best seller; it is great for warm weather and sockless use. Summer is only 3.5 millimeters thick, so wear it in ballet flats, boat shoes, golf shoes, athletic shoes, etc. Take a pair on your travels so your feet stay cool and comfortable. Go sockless, be comfortable, and save with this pack of 3 pairs.