Salomon’s Aero Blaze 4 Grvl GTX is a gravel running shoe built for wet, cold conditions. In a review, Runner’s World found that its Gore-Tex upper kept feet dry on damp, slippery routes, while its grippy sole handled loose stones and wet ground. The shoe may also suit healthcare workers who spend long shifts on slick floors, thanks to its traction and wipeable upper.
The GTX version shares its midsole, outsole, drop and stack with the standard Aero Blaze 4 Grvl. Its main distinction is the Gore-Tex membrane, which adds protection from moisture and wind at the cost of some breathability and extra warmth. The review recommends the GTX for cold or wet weather, while suggesting the regular version for warmer, drier conditions.
The shoe’s 2.5-millimeter chevron lugs are made from Salomon Contagrip rubber. They are less aggressive than the lugs on a mountain trail shoe, but provided traction on damp gravel and packed ground during testing. Their shorter profile also makes the shoe suitable for mixed routes that shift between gravel and pavement, and helps maintain grip on hard, wet surfaces.
The optiFoam² midsole offers moderate cushioning, balancing softness for extended wear with enough firmness for uneven stone. Its 8-millimeter drop is described as a traditional design that can suit people who spend much of the day on their feet. The reviewer found the ride less responsive than some running shoes, but noted that it felt quick on gravel, including uphill sections.
The Gore-Tex upper kept the reviewer’s feet dry in wet conditions and can be wiped clean after exposure to spills or grime. Its trade-off is reduced airflow compared with mesh, meaning the shoe can run warmer. The fit is a standard width with a secure, wraparound feel, though it may not work as well for runners with a particularly wide midfoot.
One issue emerged with the quickLace neo bungee system: wet gravel dust can dry on the laces and make them difficult to adjust. The review says wetting the laces can free them up, and rinsing the shoes after dusty runs can help prevent the problem.
The Aero Blaze 4 Grvl GTX is not recommended for highly technical trails, steep loose terrain, or flat, slabby rock. Its shallow lugs may not provide enough bite, and its sole does not flex enough to conform around rock features. The review instead identifies gravel and crushed-stone paths, fire roads, moderate singletrack, mixed-surface rail trails, wet-weather training and long shifts on slick floors as better uses for the shoe.
Sources: Runner's World.