Size Guide

Rock Rat is sized by the length of your foot in inches — not by shoe size.

Shoe sizing is a mess. A 42 in one brand is a 40.5 in another, half the market lists EU, and every climber downsizes by a different amount. A shoe size tells us almost nothing about the dimensions we have to fit.

An inch is an inch. Measure once and you know your size for good.

Measure your foot

Two minutes. Do it at the end of the day — feet swell, and you want the bigger number.

1. 1Paper on a hard floor, one edge against a wallNot carpet. It compresses and you will read long.
2. 2Stand on it, heel to the wallStand, don’t sit. Your foot spreads under your weight, and the spread foot is the one that has to fit.
3. 3Curl your toes the way they curl in your climbing shoesThis is the step that matters. Downsize hard and climb with your toes properly scrunched? Scrunch them. Shoes are a comfortable all-day fit? Barely curl at all. Rock Rat fills the shoe, and your shoe is holding the scrunched foot — not your relaxed street foot.
4. 4Mark the tip of your longest toeStill curled. It isn’t always the big toe. Keep the pencil upright or you’ll add length.
5. 5Measure wall to mark, in inchesThat number is the whole input.
6. 6Do both feet, use the longer oneThey’re rarely identical. Size to the bigger foot; the smaller one will be fine.

Want a second opinion? Measure the shoe instead. Slide a tape measure into your climbing shoe, flat along the sole, heel pushed all the way back, and read where the inside of the toe box ends. That's the exact length Rock Rat has to fill. The curled-toe measurement above is just a faster way to the same number.

Find your size

Land right on the line between two sizes? Size down. The smaller one can dial shorter if you measured long. The bigger one can't go below its shortest setting, and a tree that's too long won't seat in the shoe. Too short costs you tension. Too long is the error you don't want.

Under 8.6" or over 11.4"? We don't fit you yet. Email hello@rock-rat.com before you order and we'll tell you straight.

Every size adjusts

A size isn't one length. Every Rock Rat has 3 settings — shortest, middle, longest — so the range in the table above is the adjustment span. Land anywhere inside it and there's a setting for you.

• Small8.6 · 9.1 · 9.6 in
• Medium9.6 · 9.9 · 10.2 in
• Large10.2 · 10.8 · 11.4 in

Set it to the number you measured and leave it. If your shoes stretch out over a season, take it up a setting to keep the tension on.

Where your judgment comes in

The table gets you the right tree. How aggressively your shoes fit is your call, and you're the only one who knows it. That's why step 3 asks you to replicate your own toe curl instead of handing you a formula.

Some climbers live a full size below their street shoe, toes folded, arch under tension. Others sit close to true-to-fit and can walk around in them. Both are legitimate. Measure the foot you actually climb on and the table will find you.

Call it wrong and size exchanges are free — that's what they're for. See shipping & returns.