
I don't live in a cold climate but I bought these because I had early stage tendonitis in my Achilles tendon and needed assisted warmth to promote it Post-workout healing (significantly reduced intensity to avoid further injury). They take about 15-30 minutes to warm up so I activated them before I got ready for bed and when I was in bed about 20-30 minutes later they were hot. I put them on my ankle (I put on a sock first, then a hand warmer on my ankle and heel, then wrapped a compression/support bandage to keep them in place). They were still warm when I took them off the next morning. I put them on my bed and sometimes forget to throw them away and 12 hours after activation they were still quite warm. The tendonitis symptoms disappeared in just over a week. By the way I used them (this brand in particular) 15 years ago when I lived in a cold climate which is why I bought them this time knowing I was getting a quality work product. They worked just like I remembered from my school days!

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