Big Agnes Third Degree Foam Sleeping Mat - Short

The Big Agnes Third Degree Foam Mat is engineered for extreme alpine conditions but is also a great ultralight options for all back country adventures. 

Big Agnes says:

Closed cell foam provides a firm, insulated barrier between you and the ground. Plus, a comfortable backcountry seat on uneven ground and protection from snow or wet grass.

Suited to temperatures below -9C.

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The Big Agnes Third Degree Foam Sleeping Mat is one of our lightest closed cell foam mats and offers more warmth than the traditional 'flat' design. This is because the mat is designed with die cut sections on the top layer to trap warm air and has a tire tread pattern on the bottom layer to create more cushion. These two foam layers combine for more warmth and comfort.

The disadvantage of this type of mat is its size - they are big and bulky but they can be attached to the outside of your pack. The advantages of a foam mat other than the weight of course, is that you can't get a leak in it so it won't fail. You can also cut it to the size and shape you need, thus avoiding carrying extra weight.

The Third Degree Foam Mat is ideal for those looking for extra insulation under your air mat on snowy night or an ultralight stand alone option for the back country.

- Reviewed by Ultralight Outdoor Gear

Help and advice:

• Die cut sections on top layer trap warm air and tire tread pattern on bottom layer creates more cushion
• Two foam layers combine for more warmth and comfort
• Use beneath air chamber pads for additional warmth or with any pad when sleeping on frozen ground and snow
• Regular and Short sleeping pad sizes to cover all situations and the foam can be easily cut to the exact size you need

• Size: 20" x 48" / 50 x 122cm
• Rolled Size: 5" x 20" / 13 x 51cm
• EVA Foam
• Weighs: 254g
• ASTM R-Value: 1.5

ASTM R-Value:

From 2020, there is a new industry standard for measuring the R-value (level of insulation) of sleeping mats – ASTM F3340-18. This new standard is the sleeping mat equivalent to the EN rating for sleeping bags.

You can now directly compare the R-value of mats rated using the ASTM F3340-18 with confidence that is a fair and accurate comparison between mats. In simple terms, the higher the R-value, the warmer the mat.

In general terms, an R-value below 2.0 is for summer use, 2.0 to 4.0 is for cooler 3 season use and 4.0+ is for winter temperatures. This will be also be dependent on your sleeping bag, how cold you sleep etc. Please contact our customer service team if you need advice on choosing the right mat for your activity.