If your sleeping mat (or sleeping pad) measures 20" to 21.5" at its widest point:
- All Sea to Summit Small mats (unisex or Women's)
- All sea to Summit Regular mats (unisex or Women's)
You need the Regular Air Chair
If your sleeping mat measures 24" to 25" at its widest point:
- All Sea to Summit Large tapered mats
- All Sea to Summit Large Rectangular* mats
- All Sea to Summit Large Women's mats
You need the Large Air Chair
* The Comfort Deluxe SI Mats will not fit into the Air Chair
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