Idk if I need 351 or 390

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Quick Learner from Illinois

Apr 19, 2026 3:51 pm

Im not sure how to measure the bottom shoe so I can't figure if I need the 351 or 390. Thanks if you can help

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4 Replies

Bob from SWISCO

Apr 19, 2026 9:10 pm

Hi there. The difference between the Series 351 or Series 390 is the depth of the bottom shoe. See below. That's it. Measure the shoe depth to see which you need. Let us know if you have further questions.

Comparison of the S351 and S390 balance shoes.

Quick Learner from Illinois

Apr 20, 2026 10:16 am

I used two different measuring tools. Both give me over one inch But this says one and one 16th

1 user uploaded image

Bob from SWISCO

Apr 20, 2026 4:26 pm

It can be difficult to read measuring tape from a photo. But if the shoe depth is any greater than 1", you want the Series 390, even if it's not 1-1/8". Sometimes the shoes wear down from age. Let me know if you have other questions.