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All four Springbak® Springsoles listings

One patented insole, four sizing standards. Every pair is 3/32 of an inch thin, made in the USA, protected by four U.S. patents, and turns the shoes you already own into performance footwear. Price and availability below are read live from our store.

Tracked shipping from Springbak® — U.S. shipping $7.95. International shipping calculated at checkout.

Sizing guide, trimming and fits-as-is verdicts

Every sport page links here for sizing. Pick your sizing standard and normal shoe size below, then check the fit in your own shoes before training or competition.

Interactive fit quiz

Find your your Springsole size in three taps

Which sizing is printed inside your shoe?

Sizing and fit questions

Springbak US Men's Size: Which US men’s size should I order?

Order your normal US men’s shoe size. This listing covers US men’s 6/7, 8/9 and 10/11. If you fall between two ranges, take the larger one. Try it untrimmed first, then trim only the toe or forefoot in very small amounts if needed for a flat fit.

Springbak US Men's Size: How do these compare to other sizing standards?

US men’s runs roughly 1.5 sizes below US women’s and about 33 sizes below EU (US men’s 9 ≈ EU 42.5 ≈ UK 8). All four listings are the exact same patented 3/32-inch Springbak® Springsole at the same price — only the size scale printed on the package changes. The current price is shown live from our store.

Springbak US Men's Size: Will Springsoles fit court shoes, cleats, trainers and work boots?

Yes. Try the Springsole without trimming first. If the factory liner is removable, remove it and place the Springsole underneath it. If the liner is lightly glued, gently pull to see whether it releases cleanly; if it does, place the Springsole underneath it. If the liner begins to tear, stretch, deform, or resist removal, stop and leave it in place. Put the Springsole on top instead. Never force out a firmly bonded or stitched liner. Try the Springsole without trimming first. Trim only if needed for a flat fit, starting at the toe/forefoot and removing a very small amount at a time. Do not trim the heel and do not unnecessarily narrow the sides. Recheck the fit after every small trim. At 3/32 of an inch, Springsoles fit court shoes, cleats, trainers and work boots with minimal added thickness.

Springbak US Men's Size: How do I check out and what if the size is wrong?

Choosing a size here opens the secure Springbak® cart on springbak.net with this listing and your quantity already added. Payment, shipping and exchanges are handled there by the Springbak® team — email info@springbak.net or call 951-277-3000 and we will get you the right pair.

Springbak US Women's Size: Which US women’s size should I order?

Order your normal US women’s shoe size. This listing covers US women’s 7/8, 9/10 and 11/12. If you fall between two ranges, take the larger one. Try it untrimmed first, then trim only the toe or forefoot in very small amounts if needed for a flat fit.

Springbak US Women's Size: How do these compare to other sizing standards?

US women’s runs about 1.5 sizes above US men’s (US women’s 9 ≈ US men’s 7.5 ≈ EU 40 ≈ UK 6.5). All four listings are the exact same patented 3/32-inch Springbak® Springsole at the same price — only the size scale printed on the package changes. The current price is shown live from our store.

Springbak US Women's Size: Will Springsoles fit court shoes, cleats, trainers and boots?

Yes. Try the Springsole without trimming first. If the factory liner is removable, remove it and place the Springsole underneath it. If the liner is lightly glued, gently pull to see whether it releases cleanly; if it does, place the Springsole underneath it. If the liner begins to tear, stretch, deform, or resist removal, stop and leave it in place. Put the Springsole on top instead. Never force out a firmly bonded or stitched liner. Try the Springsole without trimming first. Trim only if needed for a flat fit, starting at the toe/forefoot and removing a very small amount at a time. Do not trim the heel and do not unnecessarily narrow the sides. Recheck the fit after every small trim. At 3/32 of an inch, Springsoles fit court shoes, cleats, trainers and boots with minimal added thickness.

Springbak US Women's Size: How do I check out and what if the size is wrong?

Choosing a size here opens the secure Springbak® cart on springbak.net with this listing and your quantity already added. Payment, shipping and exchanges are handled there by the Springbak® team — email info@springbak.net or call 951-277-3000 and we will get you the right pair.

Springbak EU Size: Which EU size should I order?

Order your normal EU shoe size. This listing covers EU 38/40, 41/42 and 43/45. If you fall between two ranges, take the larger one. Try it untrimmed first, then trim only the toe or forefoot in very small amounts if needed for a flat fit.

Springbak EU Size: How do these compare to other sizing standards?

EU 42 is roughly US men’s 8.5 and UK 8; EU 39 is roughly US women’s 8.5. All four listings are the exact same patented 3/32-inch Springbak® Springsole at the same price — only the size scale printed on the package changes. The current price is shown live from our store.

Springbak EU Size: Will Springsoles fit court shoes, cleats and trainers bought in EU sizing?

Yes. Try the Springsole without trimming first. If the factory liner is removable, remove it and place the Springsole underneath it. If the liner is lightly glued, gently pull to see whether it releases cleanly; if it does, place the Springsole underneath it. If the liner begins to tear, stretch, deform, or resist removal, stop and leave it in place. Put the Springsole on top instead. Never force out a firmly bonded or stitched liner. Try the Springsole without trimming first. Trim only if needed for a flat fit, starting at the toe/forefoot and removing a very small amount at a time. Do not trim the heel and do not unnecessarily narrow the sides. Recheck the fit after every small trim. At 3/32 of an inch, Springsoles fit court shoes, cleats and trainers bought in EU sizing with minimal added thickness.

Springbak EU Size: How do I check out and what if the size is wrong?

Choosing a size here opens the secure Springbak® cart on springbak.net with this listing and your quantity already added. Payment, shipping and exchanges are handled there by the Springbak® team — email info@springbak.net or call 951-277-3000 and we will get you the right pair.

Springbak UK Size: Which UK size should I order?

Order your normal UK shoe size. This listing covers UK 5/6, 7/8 and 9/10. If you fall between two ranges, take the larger one. Try it untrimmed first, then trim only the toe or forefoot in very small amounts if needed for a flat fit.

Springbak UK Size: How do these compare to other sizing standards?

UK sizing runs about 1 size below US men’s and 5 sizes below EU (UK 8 ≈ US men’s 9 ≈ EU 42.5). All four listings are the exact same patented 3/32-inch Springbak® Springsole at the same price — only the size scale printed on the package changes. The current price is shown live from our store.

Springbak UK Size: Will Springsoles fit boots, trainers and court shoes?

Yes. Try the Springsole without trimming first. If the factory liner is removable, remove it and place the Springsole underneath it. If the liner is lightly glued, gently pull to see whether it releases cleanly; if it does, place the Springsole underneath it. If the liner begins to tear, stretch, deform, or resist removal, stop and leave it in place. Put the Springsole on top instead. Never force out a firmly bonded or stitched liner. Try the Springsole without trimming first. Trim only if needed for a flat fit, starting at the toe/forefoot and removing a very small amount at a time. Do not trim the heel and do not unnecessarily narrow the sides. Recheck the fit after every small trim. At 3/32 of an inch, Springsoles fit boots, trainers and court shoes with minimal added thickness.

Springbak UK Size: How do I check out and what if the size is wrong?

Choosing a size here opens the secure Springbak® cart on springbak.net with this listing and your quantity already added. Payment, shipping and exchanges are handled there by the Springbak® team — email info@springbak.net or call 951-277-3000 and we will get you the right pair.

What does the "fits as-is" verdict mean for my shoes?

"Fits as-is" means to try the stock model with the 3/32" Springsole untrimmed first. "Fits — trim the toe" means a small toe or forefoot trim may be needed only after that first fit check. "Check your pair first" means the liner may vary by model year.

How much do I trim, and where?

Try the Springsole without trimming first. Trim only if needed for a flat fit, starting at the toe/forefoot and removing a very small amount at a time. Do not trim the heel and do not unnecessarily narrow the sides. Recheck the fit after every small trim.

Does the Springsole go above or below my insole?

Try the Springsole without trimming first. If the factory liner is removable, remove it and place the Springsole underneath it. If the liner is lightly glued, gently pull to see whether it releases cleanly; if it does, place the Springsole underneath it. If the liner begins to tear, stretch, deform, or resist removal, stop and leave it in place. Put the Springsole on top instead. Never force out a firmly bonded or stitched liner.

What size Springsole do I order for my shoes?

Order the range that covers your normal shoe size: US men's 6/7, 8/9, 10/11; US women's 7/8, 9/10, 11/12; EU 38/40, 41/42, 43/45; UK 5/6, 7/8, 9/10. Try the pair untrimmed first, then trim only the toe or forefoot in very small amounts if needed.

Will adding a layer change how my shoes fit?

The layer is 3/32 of an inch (about 2.4 mm) and the same thickness from heel to toe, so there is no heel lift and no change to plate feel, pin or stud angle, lace tension or ankle-brace fit. Springbak® adds to the shoe you already compete in — we do not replace your insole and we do not replace your shoe. Springbak beneath your feet.

My model is not in the list — can I still use them?

Yes. The picker covers the models we are asked about most. Try the Springsole without trimming first. If the factory liner is removable, remove it and place the Springsole underneath it. If the liner is lightly glued, gently pull to see whether it releases cleanly; if it does, place the Springsole underneath it. If the liner begins to tear, stretch, deform, or resist removal, stop and leave it in place. Put the Springsole on top instead. Never force out a firmly bonded or stitched liner. If you are unsure, email info@springbak.net or call 951-277-3000 with your exact model.

Force-Plate Stability Study

In force-plate testing, subjects standing on Springbak® Springsoles showed more than twice the overall resistance to being pushed from their position.

In plain English: they were harder to move. They could hold their ground better against a sideways push—exactly the kind of stability athletes need when planting, cutting, jumping, landing, and absorbing contact.

Springbak® gives the foot a more stable, responsive platform to work from inside the shoe.

Results are from the force-plate testing described in U.S. Patent No. 6,589,630 B1. Individual results vary.

Why these are performance footwear, not cushioning

Springbak® Springsoles use a patented 1,4-polybutadiene layer that returns energy instead of absorbing it. The technology is covered by U.S. Patents 5,554,694, 5,695,850, 6,120,880 and 6,589,630 B1. Read the patents and lab evidence, the force-plate proof, or our business details.

The receipts

Patented. Force plate tested.

See the patents and the studies

Patents

  • 4

    U.S. patents

    Nos. 5,554,694, 5,695,850, 6,120,880, 6,589,630 B1 — performance-enhancing athletic shoe components and methods.

    Read the patent family

Force plates

  • 2×+

    Force to displace

    Force plate testing at the Weber State University Human Performance Laboratory: more than twice the force was needed to push subjects off balance on Springsoles.

    See the force plate data
  • Balance

    & stability study

    Evaluated with Dr. Michael Yessis, Dr. Robert Wiswell and Howard Gray, PhD — stability and functional strength, measured rather than claimed.

    Read the study