The Fly Racing Snow SNX Pro Pants are a waterproof, abrasion-resistant barrier between you and sub-zero temperatures, rutted out tracks and Mother Nature. Inside the tough 450D shell is a removable thermal liner with 120 grams of insulation, adjustable boot gaiters and a removable suspenders system. The 2Cool Air snow-proof ventilation system has intake vents along the thighs to keep your temperature in the comfort zone.