Motocross underwear forms the layer worn next to the skin, under the gear and boots: tall socks that protect the leg from rubbing, protective under-shorts and shorts that cover the hips and tailbone, technical tights that wick away sweat. Notably, you can find the Alpinestars MX Plus and Pull-in MX socks, designed for rigid boots.
The rider's first layer.
A motocross sock goes much higher than a sports sock: it goes above the top of the boot and under the knee brace, so no shell edge rubs against the skin. The Alpinestars MX Plus features a one-piece construction with Dryarn fibre, which is light and barely absorbent, with mesh areas and ribbed knitting that keeps the sock in place; reinforced padding protects the ankle. The Pull-in MX follows the same principle, with a long shaft and technical fabric. A wrinkle-free sock is essential: in a rigid boot, even the slightest fold can cause a blister after a few laps.
Cross outfits also come in different styles:
All outfits are gathered on the cross outfits page.
Under the cross pants, the technical shorts, fitted and without protruding seams, limit friction when the rider stands on the footpegs and grips the bike with their knees. The protective shorts go further: they include pads or shells at the hips, coccyx, and sometimes on the upper thighs, areas that are often affected during a fall or a badly executed landing. They should be snug enough so that the pads don't shift, and it's important to check that they don't create extra thickness under the waistband of the pants, which should maintain its regular fit. In summer, a ventilated fabric helps prevent overheating.
The tights are worn under the pants, either alone or over the shorts: they cover the leg up to the ankle, eliminate direct contact between the skin and the knee pads or braces, and keep the muscles warm during chilly mornings. They should be made from synthetic fibre, which wicks sweat away from the skin; cotton retains it, cools the skin as soon as you stop, and irritates under the pads. These fabrics should be washed after each ride, at thirty degrees without fabric softener, which clogs the fibres, and then air-dried: the tumble dryer stretches the elastic fibres and causes the fabric to lose its shape.
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You should stick to your shoe size, making sure the heel of the sock aligns properly with your heel. If they're too big, they will bunch up in the boot; if they're too small, they will slip down while riding and leave your shin in contact with the shaft.
It's useful in both disciplines: in enduro, falls are often slow but repeated, on rocks or roots. A ventilated model remains comfortable throughout a long day of riding.
It's better to avoid it: cotton retains sweat, stays damp and cools the skin as soon as you take a break. A technical synthetic fibre dries much faster and doesn't stick under the pads.
At least two: you should change socks halfway through the day or after a muddy session, as a wet sock slips in the boot and causes chafing. A dry pair also brings comfort for the ride back.
Yes, the same socks and shorts can be worn for quads, trial, or enduro. In trial, where a lot of walking next to the bike occurs, thinner socks and a very breathable short are preferred.