| flex name | tuck |
|---|---|
| min order | 6 (hexaflexagon) |
| min sides | 4 |
| right triangles | yes |
| non-right triangles | yes |
| no. of pats affected | 2 |
| bending or trimming | yes |
|
The following shows an example of how a flexagon can change as a result of the tuck flex. 
To perform this flex, start by folding the flexagon in half. Open it up from the center then tuck a pair of opposite triangles into the middle. Open back up. Note that this flex also has requirements on the side opposite the tuck so you can open it back up. 
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