The larger 41 to 45 guide suited my husband’s boots, and the splitter cable reached both sides neatly

Kept my toes cosy at work

Warm feet during cold dog walks

I used these during early shifts outside, and plugging them into my power bank kept my toes comfortable for hours

Nice heat from a simple USB plug

This pair looked thin on my rug, but once inside my boots the warmth spread nicely across my toes

I laid both insoles on my blue floral sheet, connected them to a power bank, and my feet stayed cosy while cycling

Easy to trim and quick to warm

I checked the heaters with my USB meter before putting them in my black boots, and they warmed up fast for my evening walk

I liked that the cable was long enough to route from the black insole without feeling pulled inside my work boot