How to Stop Kids' Sandals from Rubbing and Causing Blisters
By The Coolest Kids Footwear – Young Soles London | Published: 2026-10-14
Category: How-to Guides
Learn how to diagnose sandal rubbing, fix it with simple adjustments, and know when to switch to a different style or fit.
Quick answer
Most sandal rubbing comes from movement, not the leather itself. Check strap tension, toe-room, and heel position first; a half-size change or a different fastening style usually solves it. If the foot slides forward, the sandal is too long or too loose.
Check strap tension and fastening position
Rubbing often starts where the strap crosses the instep or behind the heel. With riptape or buckle fastenings, you should be able to slide one finger under the strap without forcing it. If the strap leaves a red mark that fades within 15 minutes of removing the sandal, it is too tight; if the sandal shifts side to side when your child walks, it is too loose. Adjust both the instep and ankle straps—many parents tighten only one, which lets the foot pivot and creates a hot spot.
Look at toe-room and heel position
A child's foot should sit with 8–10 mm of space in front of the longest toe when standing. More than that and the foot slides forward on downhills, jamming toes against the front strap. Less than that and toes press against the edge. Also check that the heel sits centered in the heel cup—if it hangs over the side, the sandal is too narrow. Open-toe designs like the Mavis and Belle sandals let you see toe position clearly, which makes this check easier.
Break in new sandals gradually
Even well-fitting leather sandals need a short break-in period. Start with 20–30 minutes indoors, then add a short outdoor walk. Leather softens with warmth and flexing, but forcing a full day immediately can cause friction blisters before the material adapts. If your child complains of a specific spot, note it and check that area after each wear. A thin sock can help during the first few outings, though most kids prefer bare feet in summer.
When to stop adjusting and switch styles
If you have adjusted straps, checked sizing, and broken the sandals in gradually for a week, and rubbing continues, the problem is likely the last shape or fastening type, not the fit. Children with wide forefeet or high insteps may do better in a slider style with a single wide strap, like the Bunny slider, which has no toe post or multiple buckles to create pressure points. If the rubbing causes open blisters or your child avoids walking, stop wearing that pair and try a different design.
Diagnose the rub: symptom, cause, action, stop point
- Red mark across the instep: Strap is too tight or the fastening sits directly over a bony prominence. Loosen the strap by one notch. If the mark persists after 30 minutes of wear, try a different fastening position or style.
- Blister on the heel or back of ankle: Heel is lifting because the sandal is too long or the ankle strap is too loose. Check heel position and tighten the ankle strap. If the heel still lifts, the sandal is likely too long—size down or switch to a design with a deeper heel cup.
- Toes pressing against the front strap: Insufficient toe-room (less than 8 mm) or the foot slides forward on downhills. Measure toe-room while standing. If there is no gap, size up. If there is a gap but the foot still slides, the sandal is too wide—try a narrower style or a different brand.
- Rubbing along the side of the foot: Sandal is too narrow or the foot overhangs the sole edge. Check that the foot sits fully on the sole without hanging over. If it overhangs, this sandal is the wrong width—stop wearing it and look for a wider fit.
Sandals built to reduce friction
- Mavis Kids Sandal Rose Pink Leather: 70's inspired open-toe sandal with a riptape fastening strap, simple lozenger punch detailing, and a natural rubber sole. The riptape strap lets you fine-tune tension across the instep, which is the first fix for rubbing. The open-toe design also makes it easy to check toe position.
- Belle T-Bar Kids Sandal Mink Leather: Single buckle T-Bar open-toe sandal with butterfly punch detailing and a natural rubber sole. A single buckle creates one clear adjustment point rather than multiple straps that can be unevenly tightened. The T-Bar helps hold the foot back, reducing forward sliding.
- Bunny Kids Slider Sandals - Vanilla Leather: Slider sandal with leather upper, natural leather lining, soft suede comfort insole, natural cork and rubber sole, and signature 'bunny ears' bow detailing. The wide, single-strap slider design eliminates toe posts and multiple buckles, making it a good option for kids who get rubbing from traditional sandal straps.
