Pictured above is one of 45 Norths most popular products apart from their fat bike tyres of course. Its the Greasy 100 % merino wool double layer cycling cap. It fits comfortably under your helmet and the ear flaps work fantastic in winter, keeping the cold winds at bay and once off the bike you can raise the ear flaps which then looks like a standard cycle cap. The brim is flexible so you can stuff the cap in a pocket or bag and pull it out when needed. This winter I have hardly taken it off as its so comfortable. If you are looking to keep your biscuit warm this winter look no further than the greasy !. Check out the other products from 45 North as well , their specialty is winter cycling and for a new company have a fantastic range of well designed products that work well.