Sea to Summit Camp Plus SI Self-Inflating Sleeping Mat
- Item Depth: 2.6 inches
- Item Thickness: 2.6 inches
- Item Weight: 3 pounds
- Item Firmness Description: Medium
Last refreshed Sep 10, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A 4.3 R-value with a self-inflating foam core and a reinforced valve covers cold-weather camping reliably, at the cost of packing larger and heavier than an inflate-by-mouth pad.
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ASIN: B0GFY2WTVLCategory: Self-Inflating Sleeping Mats
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Overview
The Sea to Summit Camp Plus SI is a self-inflating foam sleeping mat, 2.6 inches thick with a 4.3 R-value, built in a rectangular regular size that measures 72 by 25.2 inches and packs to 13 by 7.5 inches at 3.2 pounds.
Unlike a pure air pad, the foam core here self-inflates once the valve is opened, so setup and cold-ground insulation come from the foam-plus-air combination rather than lung power or a pump alone.
- 4.3 R-value self-inflating foam core
- Reversible valve plus xpel valve for tighter rolls
- 72 x 25.2 inch rectangular regular size
- PillowLock patches for attaching a pillow
Who it's for
Campers who want a self-inflating pad with a printed R-value for cold ground and do not mind the extra packed size and weight compared with air-only mats.
Pros and cons
- 4.3 R-value for cold-ground insulation
- Self-inflating, no pump or blowing required to open
- PillowLock patches to attach a Sea to Summit pillow
- Durable 75D polyester face fabric
- Packs to 13 x 7.5 inches and 3.2 lbs, bulkier and heavier than air-only pads
- No review text on file yet to confirm long-term foam recovery
- Rectangular shape adds material and weight versus a tapered mummy cut
Performance notes
Opening the reversible valve lets the open-cell foam core expand and pull in air on its own, and the same valve flips to one-way deflation for packing, with an added xpel valve meant to let air escape faster for a tighter roll. Body-mapped coring keeps foam density higher where the body makes contact and lower elsewhere, aiming to hold warmth without adding bulk everywhere.
Specifications
| Brand | Sea to Summit |
|---|---|
| Dimensions & fit | |
| Item Depth | 2.6 inches |
| Item Weight | 3 pounds |
| Item Dimensions | 72 × 25.2 × 2.6 inches |
| Item Dimensions L x W x Thickness | 72 × 25.2 × 2.6 inches |
| Construction & materials | |
| Construction Type | Latex Foam |
| Fill Material | Foam |
| Mattress Comfort Layer Material | Comfort Foam |
| Material Type | Polyester |
| Cover Material | Polyester |
| Color | Green |
| Warranty & support | |
| Manufacturer Warranty Description | Lifetime |
| Other details | |
| Item Thickness | 2.6 inches |
| Item Firmness Description | Medium |
| Number of Layers | 4 |
| Number of Items | 1 |
| Specific Uses For Product | Sleeping Pad |
| Additional Features | Inflatable |
| Shape | Rectangular |
| Item Highlight | Extra-thick 4-season self-inflating foam sleeping mat with a 4.3 R-value insulates comfortably against the coldest ground |
Frequently asked questions
Does the Camp Plus SI mat inflate itself?
Yes, opening the valve lets the foam core self-inflate, and it can be topped off by mouth if needed.
What is its R-value?
4.3, rated for 4-season use down to cold ground temperatures.
How much does it weigh packed?
3.2 pounds, packing to 13 x 7.5 inches in the rectangular regular size.