# Variflex variants or flat foot

**URL:** <https://opensourceleg.discourse.group/t/variflex-variants-or-flat-foot/201>\
**Category:** Hardware\
**Created:** [April 1, 2026, 7:27pm UTC](https://opensourceleg.discourse.group/t/variflex-variants-or-flat-foot/201 "2026-04-01T19:27:25Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![tadeo.casiraghi](https://avatars.discourse-cdn.com/v4/letter/t/58956e/32.png) [@tadeo.casiraghi](https://opensourceleg.discourse.group/u/tadeo.casiraghi)\
**Post date:** [April 1, 2026, 7:27pm UTC](https://opensourceleg.discourse.group/t/variflex-variants-or-flat-foot/201/1 "2026-04-01T19:27:26Z")

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Hi everyone,

I’ve been looking into the Onshape design that uses the Össur Vari-Flex LP foot, and I had a few questions I’m hoping someone here might be able to clarify:

1. **What size of the Össur Vari-Flex LP foot is used in the Onshape design?** I couldn’t find a clear reference to the exact size (e.g., 27, 28, 29, etc.) used as the basis for the model.

2. **Is the design compatible with other Vari-Flex LP sizes?** For example, if the design was made around a specific size, would it still work with a size 27? More specifically, can the same proxy pyramid adapter/interface be reused across different foot sizes, or does that geometry change significantly between sizes?

3. **Flat foot (research papers / prototypes)** In some papers and prototypes, I’ve seen a simplified “flat foot” version used instead of a commercial carbon foot:

Any insights, measurements, or links to documentation would be really appreciated.

Thanks in advance!