Yes, you heard right, Heat Wave from Red Heart will actually self activate to keep you warm while you're outside this winter. 

This revolutionary yarn is activated by sunlight, even on a cloudy day, to keep you up to 12 degrees warmer. 

Upgrade your outdoor gear and stay warm at sporting events, everyday outside activities or even walking your dog. 

Worsted weight, machine washable and dryable

How do they do it? I don't know but try one of our crochet patterns to test it out for yourself.