HJC i-50 Helmet. SLID technology has been developed to minimize damage to the brain by dispersing impact. It employs a special gel liner located inside the helmet that provides rotating function. The layer has flowable properties, allowing it to counter the rotation acceleration, dispersing the rotating impact when a multiple-direction impact occur, Features Advanced Polycarbonate Composite Shell Lightweight, superior fit, and comfort using advanced CAD technology Impact-absorbing, multi-density EPS liner Maximum range adjustable visor SLID (Sliding Layer Impact Distribution) Air gel built into liner improves comfort, softens impact effectively and manages multi-directional shock Large Eye Port Maximum visibility and superior goggle fit Aerodynamic rear spoiler ACS Advanced Channeling Ventilation System Top and forehead intake vents combine with rear exit vents to provide flow-through ventilation that helps to pull heat and humidity up and out of the helmet's interior SuperCool® Interior Lining More comfort in dirt and off-road conditions Crown and cheek pads are removable and washable Cheek pads are interchangable throughout all shell sizes Nylon Strap Double D-Ring Retention System Neatly secures chin strap Technical Information Standards: ECE and DOT Approved Construction: Polycarbonate Composite Weight: 2.95 lbs / 1340 grams (approx, based on Size Medium Solid Color) Sizing Wrap a tape measure horizontally around your forehead. Select the helmet that is the closest fit to that size. A helmet should fit snug on your head. If it moves while wearing, it is too large. If it is painful to wear, it is too small. Size Chart Size CM: Hat Size Inches XS 53-54 6 5/8 - 6 3/4 20 7/8 - 21 1/4 S 55-56 6 7/8 - 7 21 5/8 - 22 M 57-58 7 1/8 - 7 1/4 22 3/8 - 22 3/4 L 59-60 7 3/8 - 7 1/2 23 1/4 - 23 5/8 XL 61-62 7 5/8 - 7 3/4 24 - 24 3/8 2XL 63-64 7 7/8 - 8 24 3/4 - 25 1/4
