Petzl Boreo Climbing Helmet - Red S/M Review (2026)

Construction and protection

The Boreo pairs a thick ABS outer shell with dual EPP and EPS foam liners, a hybrid design Petzl uses to extend impact protection to the top, side, front and rear of the head rather than focusing mainly on top impacts. That broader coverage is part of Petzl's top and side protection label across its current helmet range. This S/M size weighs about 300 grams, heavier than a dedicated foam helmet like the Sirocco but built to handle more day-to-day knocks and scrapes without showing damage. The Boreo is certified to CE EN 12492 and UIAA standards, matching the testing bar for the rest of Petzl's helmet lineup regardless of color or size.

Fit and sizing

This S/M size covers head circumferences of roughly 48 to 58 centimeters, which fits many teenagers, adults with smaller heads and climbers who find a standard M/L helmet sits loosely. Fit is adjusted through lateral webbing and a fully adjustable chinstrap rather than a tension dial, and the helmet folds flat for storage thanks to a foldable headband design, useful for coaches and parents who need to pack several helmets for a group outing. The red color is purely cosmetic and does not change the fit or protection compared with the blue or other Boreo color options.

Visibility and everyday use

The bright red shell stands out clearly against rock, foliage and gym walls, which some climbers and instructors prefer for keeping track of who is wearing which helmet in a group setting, or simply for standing out in photos and video on a route. Ventilation holes in the shell help manage heat on warm days, though as with the blue edition, a hardshell-based design will run warmer over a full day than an all-foam helmet. Two front clips and a rear elastic band secure a headlamp for early starts, matching the setup used across the rest of Petzl's helmet range, so climbers switching between Petzl helmets will find the headlamp attachment familiar.

Durability for beginners and shared gear

The ABS shell's main advantage is resisting scratches and knocks better than foam-only helmets, which makes the Boreo a common pick for beginner packages, guiding services and gyms that need helmets to survive being handled by many different climbers over a season. Petzl backs it with a three-year warranty, longer than the two-year terms offered on some hardshell helmets from other brands. For a first helmet, the combination of tough shell, broad coverage and lower price relative to ultralight foam helmets makes the Boreo a practical entry point, since new climbers are more likely to drop or knock a helmet around while still learning gear habits and how to pack a rack properly.

Who should buy the red S/M Boreo

This size and color fit smaller-headed climbers, teenagers and beginners who want a durable, affordable helmet with strong side and rear coverage. It works well as a first helmet for someone new to trad or multi-pitch climbing who has not yet invested in an ultralight setup, and the red color helps it stand out in a group or shared gear pile. Climbers with larger heads need the M/L size instead, and anyone prioritizing the lowest possible weight for long alpine days will likely prefer a foam helmet such as the Sirocco over this heavier hybrid design.

Frequently asked questions