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Item # STSAA209M

Sea to Summit UltraLight SI Mat

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Starting At: $99.00

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Providing the comfort of self-inflating foam at minimal weight and a compact packed size, the Sea t Summit UltraLight SI Mat is an ideal option for backpacking.


Providing the comfort of self-inflating foam at minimal weight and a compact packed size, the Sea t Summit UltraLight SI Mat is an ideal option for backpacking.

The tapered pad uses Delta Core Technology to create supportive cushioning and make inflation efficient. Body-mapped die-cutting in the open-cell foam core adds structural support in the shoulders, the hips, and at your feet while cutting down on bulk in areas of the pad where less support is needed. This design also helps to cut down on weight and allow the mattress to roll up more compactly when not in use. Lightweight 30D polyester face fabric balances weight and durability. A silicone print provides a slip-proof surface. The pad’s 2.6 R-Value makes it ideal for warm-weather use.

A stand-out feature on Sea to Summit pads is the low-profile multi-function valve. A one-way design allows for fuss-free inflation and an internal button lets you make micro adjustments to firmness. A larger port beneath the top portion of the valve makes deflation quick and easy. Additionally, by setting flush to the surface of the pad, the valve also cuts down on potential warranty issues.

Available in your choice of Xsmall (49” x 20” x 1”), Small (67” x 20” x 1”), Regular (72” x 20” x 1”), and Large (78” x 25” x 1”) size options, the Sea to Summit UltraLight SI Mat includes a custom-fit 30D stuff sack.

  • Delta Core-V Technology minimizes weight and bulk while maximizing warmth
  • Patent-pending multi-functional one-way valve for easy inflation and deflation
  • Lightweight 30D polyester with extrusion-laminated TPU on top and base
  • Anti-slip silicone print on top and bottom
  • Environmentally-friendly polyurethane self-inflating foam
  • 30D stuff sack included
  • R-value of 2.6
  • Extended storage instructions: mat should be laid flat, folded as few times as possible with valve open

Technical Specs

Best Use
R Value
Item Weight
Xsmall: 13 oz
Small: 1 lb, 2 oz
Regular: 1 lb, 3 oz
Large: 1 lb, 9 oz
Item Dimensions
Xsmall: 49" x 20" x 1"
Small: 67" x 20" x 1"
Regular: 72" x 20" x 1"
Large: 78" x 25" x 1"
Stuff Sack Included
Limited Lifetime
Self-Inflating Sleeping Pad

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