This is a White Troxel Sport Low Profile Equestrian Helmet in Medium. This helmet will fit you if the circumference of your head is 56 to 58 cm(22" to 22 3/8") or if your hat size is 7 to 7 1/8. It includes a washable headliner and has extra padding for added comfort.
I bought this for a 15 year old neighbor who has started taking riding lessons. She loves it and I feel she is protecting her head much better than a loner helmet.