Mido only runs their own days. You want the leathers somewhat snug but keep in mind if you plan to put a back or chest protecter (at some point in the future) in they may not if the suit is too snug without them. From the mido site on the boots. All riders must be at least 18 years of age and have a valid driver's license. Damage free DOT or SNELL full-face helmet with face shield. Riding boots that fully cover the ankle. Gauntlet style gloves with full wrist coverage. One or two piece leathers. Two piece leather suits must zip together for intermediate or advanced groups. Ballistic nylon suits such as Joe Rocket, AeroStitch etc. are acceptable in the Novice and Intermediate Group only provided they are either one piece or zip together with at least 50% zipper contact with reinforced and padded shoulders, elbows, hips, and knee areas. No chaps. Advanced and Intermediate group riders MUST WEAR A BACK PROTECTOR. Soft back pads sewn into suits are not enough. No back protector = no track time! LEATHER RENTAL: Leathers can be rented from The Mid-Ohio School for your trackday. Leathers are available in sizes 40, 42, 44, 46 and 48 and provided by Tucker Rocky. Unsure of what size you need? Visit ssgear.com, go to the men's sizing chart for race suits and compare your measurements as illustrated on the chart