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Comfort Plus Self-Inflating Sleeping Mat


4.6 star rating 13 Reviews

$139.95 – $269.95

Size Guide

Sleeping Bag Temperature Ratings Explained

The EN Rating scale is a scientific test to determine the warmth of a sleeping bag. The test produces a Lower rating (for male sleepers) and a Comfort rating (for female sleepers). Both are listed in the features table on the product page.

A unisex sleeping bag with a Lower limit of 23ºF means a man should be comfortable down to air temperatures of 23ºF. The same bag will also have a Comfort limit, in the realm of 32°F, so a woman would be comfortable down to an air temperature of 32ºF. These ratings require a sleeping mat with an R-Value appropriate for expected ground temperatures – without this, the sleeping bag itself is unlikely to keep the sleeper warm enough.

A variety of factors impact sleeping bag warmth - the above temperatures are merely guidelines, not guarantees. It’s important to think of a sleeping bag, an appropriately insulating sleeping pad and a liner as a sleep system. For example - if you plan on sleeping in nighttime air temperatures of 27ºF / -3°C, choose a bag with a gender-appropriate rating of 23°F / -5°C, plus a sleeping mat with an R-Value of 2.5 to 3, and consider a Reactor thermal liner.


Camping luxury has a new look and feel with the Comfort Plus™ Self Inflating Sleeping Mat. This is a plush, 3-inch thick, light and easy to use option for anyone looking for maximum comfort. The Delta Core™ technology removes weight and bulk without compromising comfort.  A lightweight but luxurious 30D stretch knit fabric is used on the top surface and each mat is embossed with a non-slip grip print to keep your sleeping bag on the sleeping mat. We've literally put a twist on our multi-function valve to ensure super-fast deflation without fighting re-inflation as you roll it up.

Our blog post "Which Mat Should I Choose" has some helpful tips on picking the perfect self-inflating mat (or reasons why you might prefer an air mat).

Is the Comfort Plus Self-Inflating Sleeping Mat...?

  • Insulated well enough for three-season temperatures? Yes. The Comfort Plus SI Mat has a tested R-Value of 4.1 – suitable for anything but really cold ground.
  • Small enough when packed to use for backpacking? Possibly. If you are only hiking for a short distance, the weight (34ozs) and packed size (7” x 10”) – both size Regular – could work. For longer trips an air mat would be a better option– see below.
  • Easy to pack up? Relatively easy. The flip-over valve prevents the mat from drawing air back in while it is being rolled up – but the larger sizes (including the Double) still require a little effort to pack into their stuff sacks.



Regular: 2 lb 2 oz ≈ Lighter than two paper towel rolls

Packed Size Comparison

Regular: Similar to a roll of paper towels


4 Season: Warm enough for spring to fall and even winter camping


This luxurious fabric has been engineered to provide you many nights of camping comfort


  • R-Value of 4.1 - sufficient warmth for early Spring to late Fall. Click here to learn about the new ASTM R-Value test standard.
  • 3” thick foam and the knitted polyester upper face fabric provide an amazingly comfortable night’s sleep
  • Flip-over multi-function valve for fast and easy inflation, deflation and fine-tuning of air pressure
  • Silicone print prevents your sleeping bag from slipping on the mat, or the mat slipping on the tent floor
  • Utilizes Delta Core technology, which significantly reduces weight and packed volume
  • Supplied PillowLock patches keep your Sea to Summit pillow firmly attached to the mat

Technical Features

Delta Core™

The innovative Delta Core™ system maximizes the comfort and thickness of our Self Inflating mattresses while minimizing weight and bulk. 40% of the initial volume of the PU foam is removed in horizontal Delta-shaped cores, giving minimal weight and packed size. Importantly, the top and bottom surface of the PU foam remain completely intact. This ensures consistent warmth along the full length of the mattress and significantly improves bonding of the foam to the shell fabric, which reduces the chance of delamination.

The shape and size of the Delta Cores™ are adjusted across the different thicknesses of our mattresses to ensure strength and durability combined with excellent support. The horizontal Delta Core™ technique is used in our Comfort Light SI, Comfort Plus SI, and Comfort Deluxe SI models.

SI Multi-Function Valve

We have literally put a new twist on our very successful multi-function valve so it specifically addresses the inherent characteristic of self-inflating mats - that is, the problem of the foam trying to re-inflate as you're packing up. We've engineered the "one-way" inflation valve to be reversed and used to prevent the mat from drawing air back in. This allows you to roll the mat up as small as possible without fighting re-inflation as you go. This patent-pending valve design has the same slim profile, faster inflation than traditional screw valves, easy pressure fine tuning, and super fast deflation rate as our air mattresses and pillows.

Pillow Lock™ System

The Pillow Lock™ System comprises of self-adhesive hook-and-loop patches which are supplied with all Sea to Summit sleeping mats (as of Spring 2019),

Attached to your sleeping mat, these patches secure your pillow and prevent it slipping – yet they will not snag on clothing or other lightweight fabrics.

All Sea to Summit Pillows (as of Spring 2019) are compatible with this system. Existing pillows can be made Pillow Lock™ compatible by adding an Aeros Pillow Case.

Tech Specs

Product Details

Best Use
Short backpack trips, Camping, Winter Camping
Comes With
Stuff Sack
30D polyester knitted upper, 30D polyester base
Delta Core technology
Season Rating
4 Season
Multi-function valve that prevents re-inflation as you pack up
3.125 in / 8 cm
comfort-plus-self-inflating-sleeping-mat-regular.svg comfort-plus-self-inflating-sleeping-mat-large.svg comfort-plus-self-inflating-sleeping-mat-double-wide.svg comfort-plus-self-inflating-sleeping-mat-rectangular-wide.svg comfort-plus-self-inflating-sleeping-mat-rectangular-large.svg
72 in x 20 in / 183 x 51 cm
6.5 x 11 in / 17 x 28 cm
3 in / 8 cm
2 lbs 2 oz / 970 g
78 in x 25 in / 198 x 64 cm
7 x 13.5 in / 18 x 34 cm
3 in / 8 cm
2 lbs 14 oz / 1300 g
72 in x 50 in / 183 x 128 cm
9.75 x 26 in / 25 x 66 cm
3 in / 8cm
5 lbs 13 oz / 2635 g
72 in x 25 in / 183 x 64 cm
8.6 x 13.5 in / 22 x 34 cm
3 in / 8 cm
3 lbs 1 oz / 1380 g
79 in x 25 in / 201 x 64 cm
9 x 13.5 in / 23 x 34 cm
3 in / 8 cm
3 lbs 4 oz / 1470 g


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