A lightweight, closed-cell foam flexibility folds over while offering superior temperature holding power. Food safe. Thermo Snap closure will keep the temperature of your food and drinks. Fold and go packing. Adjustable grid allows you to decide the size of your lunch bag by sliding the closing hook into one of the loops. I bought this for my wife who hated taking her lunch, but now she loves taking her lunch everyday thanks to this yeti lunch cooler. It’s the perfect size and keeps everything cold throughout the day. She also loves the color!