These V-Gard's Protective Caps are part of the same family of products and accessories recognized as the best-selling in North America. Polyethylene shell and self-adjusting crown straps provide comfortable, lightweight protection. MSA V-Gard slotted caps meet all applicable requiremtns for a Type I (Top Impact) helmet as outlined in ANSI/ISEA Z89.1-2009 (Class E). V-Gard caps also meet the voluntary standard for low temperature and reverse donning. 4-Point Fas-Trac's ratchet suspension allows for easy adjustment and a custom, true to size fit every time.