I rarely used this, and it mostly stayed in my diaper bag (＞人＜;) I think you can use it not only in the hot season but also in the coming cold season ^ ^ I think it's in good condition, but please understand that it is a used item before purchasing (*'▽'*) A feeding bottle case with a design of The Very Hungry Caterpillar. The inside is aluminum-coated for heat retention. - Brand: ERIC CARLE - Design: Caterpillar and stars pattern - Inner material: Aluminum coating - Strap: Removable strap Thank you for looking.