Alpinestars Fluid Kepler Pants

Entry-range MX pants in the Kepler graphic

The Fluid Kepler Pants are Alpinestars' recreational motocross pants in the Kepler colourways. Fluid is the entry range, built with the same key construction as the Supertech, Techstar and Racer lines but cut with the most relaxed fit of any of them: a lightweight polyfabric chassis with reinforced 600D on the seat and knees, extra reinforcement at the back yoke, upper knees and backs of the legs, extended stretch corduroy panels at the crotch, knees, back yoke and inside legs, and synthetic leather inner knees. Pre-curved legs, a mesh lining and a ratchet closure round it out.

Sizing and fit

Waist sizes 28 to 40 in two colourways: Blue and Purple/Orange. The relaxed sport fit leaves room for knee guards at your normal size, and the ratchet closure lets you fine-tune the waist. Women's cut: the Stella Fluid Kepler Pants.

Match it up

Pairs with the Fluid Kepler Jersey in the same colourways. Add Radar Gloves, SX-1 v2 Knee Guards and MX Plus Socks.

The Fluid line offers recreational MX riders gear with optimal MX technology that leverages the key construction features of the Supertech, Techstar, and Racer lines for a total performance look and feel that is optimized for comfort and riding functionality. Developed and tested on some of the toughest terrains around the globe, the sport fit Fluid gear is ideal for many forms of off-road riding and provides the most relaxed fit of all the MX27 gear lines.

• Sport-inspired fit: A relaxed on-bike profile helps reduce bunching and supports natural movement through standing, seated, and transitional riding.
• Articulated shaping: Pre-curved leg geometry helps the pants sit correctly in the riding position for a more natural feel at the knees and hips.
• Ride-ready comfort: A clean, low-distraction wear feel helps keep the pants composed and comfortable through long motos and repeated off-road sessions.
• Reinforcements are positioned on key areas including the back yoke, upper knees, and backs of the legs.
• Reinforced 600D polyfabric on the seat and knees provides added durability in critical contact zones.
• Synthetic leather on the inner knees delivers enhanced durability in a high-wear area.
• Ergonomic cut and 3D pattern construction.
• Extended stretch corduroy fabric panels on the crotch, knees, back yoke, and inside legs.
• Mesh lining.
• Ratchet closure.
• Zippered fly.