This is a Rapha classic, the Merino Hut, featuring a brim, a windproof front panel, and thin ear covers. Although it has never been used for riding, please judge the condition from the photos as it has been stored. The size is One Size, equivalent to Rapha caps, and I think it's similar to S/M. It has high elasticity, but it might be tight for head sizes over 60cm. It's thin, making it ideal as a helmet liner for winter.