Atomic REDSTER STI 90 LC Ski Boot 2025

The Atomic Redster STI 90 LC is a feature-packed race boot designed specifically for lighter junior racers – with a lower cuff to fit shorter legs.

While the Atomic Redster STI 90 LC is for lighter junior racers, the only thing junior about this race boot is the cuff height, just a little bit lower for younger legs. Atomic’s World Cup liner tech make sure it’s got great feel and a precise connection between liner and boot shell. The Slim Race Shell makes it easier to flex than normal junior race boots. Power Control lets racers adjust both the forward lean and the precise stiffness of the boot – letting them lock in their preferred feel for tons of confidence on race day. Junior racers will feel like they’re in the big leagues with the Redster STI 90 LC.

Weight (g) / Boot (Size): 1,850 / 24-24.5

Gender: Unisex

Terrain: Race

Flex: Medium

Boot-binding compatibility: Alpine, Gripwalk, MNC, MN

True Size Mondopoint 22
On our women's models, we offer a true shell size in MP 22 plus an appropriate liner construction.

Power Control
Allows for forward lean adjustment and an extremely solid connection of the cuff to the shell.

Full PU Construction
Both cuff and shell are made from polyurethane (PU) plastic to deliver outstanding skiing performance.

Low Cuff - All Sizes
A 15mm lower cuff on all sizes within the size range.

Racing Sole (non-replaceable)
Solid plastic sole used in World Cup racing that delievers performance, stability, and precision.