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The quick verdict: A kids' ski boot that expands across six sizes with a crank, potentially covering three winters of foot growth for the price of one ordinary pair. ~$150
The Idea Free attacks the worst economics in family skiing: boots that fit in December and pinch by March. A crank mechanism in the heel expands both shell and liner from mondo 22.5 to 25.5, the equivalent of six junior sizes, with the liner adapting to keep the fit reasonable at each setting. Entry is designed to be easy for kids to manage themselves, and a power strap adds support as they get faster. The smaller Idea Up covers mondo 19.0-22.0 for younger skiers.
Growing recreational skiers from roughly ages 8 to 13, and any family doing the math on three kids' worth of boots. Skip it only if your kid is racing gates or has stopped growing, in which case a fitted single-size boot serves better.
See how it stacks up in our full guide: The Best Kids' Ski Gear of 2025-26. Other picks from that list: Smith Glide Jr. MIPS · Smith Snowday · Patagonia Kids' Powder Town Jacket · Hestra Heli Ski Jr. Mitt · Smartwool Kids' Wintersport OTC.