Castelli Viva Thermo Skully
Castelli’s skullcap is warm and stretchy and it’s slimline enough to fit comfortably under your bike helmet.
Let’s be honest, skullcaps never look great. They’re like overshoes in that they’re ugly as sin but they do the job. File them under ‘necessary evil’. Castelli’s Viva Thermo Skully actually looks okay, though, in our humble opinion. Worn under a helmet, it’s acceptable, we’d say.