Giro Quarter Helmet review

The Quarter Helmet is Giro's skate-style dirt model, a different proposition from an open road shell with a visor or an urban commuter helmet with built-in electronics. Giro's US product page describes it for trails or the skate park, names a polyurethane bumper and gives an explicit US CPSC statement. This assessment covers the observed Matte Black route for US style 100000000500000002. The listing route identifies a color, not a chosen size, and the review does not claim hands-on use or impact testing.

A skate-inspired shell for rough everyday handling

Giro says the Quarter has an EPS liner, tough outer shell, riveted webbing anchors and plush, sweat-absorbent pads that can be changed to adjust the fit. The polyurethane bumper is described as protecting the EPS liner from everyday wear and tear. That construction makes the model's stated dirt-and-skate-park brief clear, but it is not a measured durability result and does not establish performance after an impact. Follow the manufacturer's use and replacement guidance rather than treating a scuff-resistant feature as permission to keep using a damaged helmet.

The exact product page calls this a skate-style dirt helmet and the manufacturer reference image shows a rounded shell without a chinbar. It is not documented as a full-face mountain-bike helmet. The page does not quantify ventilation or describe an adjustable retention dial; its stated fit-related details are three Super Fit sizes and replaceable plush pads. A buyer should therefore check the exact fit and strap setup rather than expecting an adjustment range that is not listed.

Three adult sizes, with overlapping circumference rows

The page lists S, M and L, and Giro's adult bicycle chart maps those choices to 51–55, 55–59 and 59–63 cm. At 55 cm or 59 cm, two adjoining size rows meet; the overlap does not decide which shell is right. A circumference match only identifies a model-size combination worth trying. Check that the helmet sits level, covers the forehead appropriately and remains stable when adjusted according to the instructions. The source does not describe an internal head-shape profile or guarantee that a chart measurement will fit a particular rider.

Giro lists 450 g for a Medium CPSC/CE reference. That is a manufacturer-stated weight, not an independent measurement, and it does not mean each size or color weighs exactly the same. The exact page also states compliance with the US CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older. Confirm the physical label on the actual unit; a product page cannot confirm the history, condition or authenticity of a used example.

Do not infer Mips or a different standard

The exact Quarter page discusses an EPS liner, shell and polyurethane bumper but does not name Mips or Spherical Technology. This review therefore records no documented rotational-impact system for the observed style. That is a fail-closed evidence decision, not a blanket statement about every similarly named product. A separate Quarter Mips or special edition, if observed, must be reviewed against its own exact page and retained as its own configuration when its features differ. A CPSC statement does not fill a missing Mips field, and a Mips label would not replace checking the physical standard mark.

There is no stated weight for sizes S or L, no exact vent count and no independent ventilation, durability or impact comparison in the reviewed sources. Giro's description of the bumper and padding identifies features to inspect, not performance measurements. If a lightweight road setup, visor, powered light or specific retention adjustment is essential, this page does not document those features.

Where it sits beside trail alternatives

The Quarter's trail reference is its skate-style shell and dirt-helmet description. Artex Mips is a different half-shell with a removable visor and a documented Mips design, while Montaro Pro is a trail/enduro helmet with Spherical/Mips and a different fit system. Those are not rankings: the exact pages describe different shell features and use language, and the review library does not claim any one design is safer for a particular rider. A rider who needs full-face coverage should compare the separately reviewed Coalition Spherical style 027 and check its distinct certification evidence.

Quarter's strongest documented fit with the brief is its combination of skate-style dirt construction, a wear-oriented bumper, three adult size choices and a direct CPSC statement. Its tradeoffs are the absence of a named rotational-impact system, numeric vent count and a dial-adjustment specification in the exact page. Measure, try the correct size on and inspect the label and shell before riding; neither the 450 g Medium figure nor the CPSC statement is a personal-fit or injury guarantee.