Here's a tip for winter riding, or even just keeping warm what ever you're doing. Heat up one of those theraputic gel pacs in the microwave then place it across your chest if it's big enough under a jacket, I use a velcro strap to keep it in place, it keeps your core temp warm & stops your extremeties from getting cold. I've got heated grips but I rarely use them 'til I've done at least twenty miles in the coldest weather 'cause of the gel pack, it's good for around the house too, saves on heating bills which are flipping sky high at the moment, give it a go & see what you think.