Ultralight S.I (Self Inflating) Sea to Summit Mattress Test

The Ultralight S.I (Self Inflating) Sea to Summit self- inflating mattress was designed using Delta Core cut foam-V™. Optimized warmth for essential areas. Minimum weight for other areas. Non-slip top and base. Helps hold your sleeping bag and mattress in place. Multi-functional, high-flow valve. Allows for easy inflation and one-way deflation (prevents the mattress from re-inflating when stored) and careful adjustment for comfort. 30D fabric. Compact and lightweight.

Designed from the Ultralight S.Itest.

Siesta after a hike on the heights of Mont Veyrier with a plunging view of Lake Annecy. Tested with a Deluxe premium pillow and the Amber Eb3 duvet from Sea to Summit.

Test of the self-inflating mattress

Once out of the cover, simply remove the valve and choose the notch that allows the mattress to be inflated automatically. In about 4-5 minutes the mattress is automatically inflated. However, you only need to give it a little blow with your mouth to finish it off.

Although it is ultra light, we appreciate its comfort and after a test on stones or simply on grass our back does not touch. It is still necessary to choose the size of the mattress in proportion to his.

To deflate it, choose the position that does not allow the mattress to deflate. This is the great advantage of the Sea to Summit self-inflating mattresses because it is often a mess to fold up.

Then you just have to put it back in its cover.

Size comparison :


  • Free delivery
    from 119 € (* see conditions)

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  • Customer service
    by phone on +33 (0)9 72 306 150
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