You step outside and start running and realize, “It's cold and I forgot my gloves.” Fortunately, sports apparel manufacturers have recognized my tried-and-true runners' solution of tucking my hands into my shirt sleeves. Several fitness shirts, such as Nike's winter training turtleneck, have built-in “handwarmers.”
How do they do it? The sleeves on handwarmer athletic shirts are a few inches longer and feature thumbholes for you to hook your thumbs through and pull the fabric to cover the back and palm of your hand.
The pro: You have some hand warmth without the worry of losing gloves if you get warm enough to take them off.
The con: Your fingers are still exposed, but thin microfiber gloves will keep them warm and allow your thumbs to fit through the handwarmer thumbholes.