They're built for ski lifts, not handlebars
Most winter gloves pile on bulky insulation to keep still hands warm. On a bike, that bulk works against you: you lose feel on the hoods, braking gets vague and shifting turns into guesswork. So you grip harder, which restricts blood flow and makes cold fingers even worse.
What actually works
A slim, feather-light fit with an anti-slip palm. You keep precise control of brakes and shifters, and a relaxed grip keeps blood moving to your fingertips.