This is a Kask time trial helmet. Size: L Purchased 4 years ago and used about 3 times. It is a domestic genuine product and has a JCF seal, so it can be used in the J-Cycling Federation. Includes case and clear visor. The original box will be wrapped with packing tape for shipping. TT helmets often fit the long, narrow heads of Westerners, but this product fits the round heads of Asians. No returns or exchanges accepted.