热特性和保温：可以在冬季使用。
从2020年初起，我们通过ASTM F3340-18标准，评估地垫的防潮性能。ASTM F3340-18这项标准测试表明，这款地垫具有良好的防潮效果，可以有效阻隔来自地面的潮湿，从而留住身体的热量，保持身体舒适。泡沫材质，隔热性好。
R值按照 ASTM F3340-18标准计算得出。

热特性和保温
R值表示防潮垫的热性能和阻抗。 R值越大，防潮垫隔绝冰凉地面的能力越强。
- R值从0-1.9：仅适合在较热天气使用（例如夏天）
- 2-3：适合两至三个季节使用（例如春夏秋）
- 3-4：一年四季均可使用，即冬天也不例外
- 高于4.5：冬季使用和极限温度

What is the ASTM F3340-18 R-Value Standard?
Similar to EN/ISO ratings for sleeping bags, the ASTM R-value standard ensures an “apples-to-apples” comparison of R-value for the sleeping pad market. R-value is a measure of a material or structure’s thermal resistance to heat loss. In this case, the structure is your sleeping pad. The higher the R-value, the more thermally resistant the material or structure is. This number gives a definitive rating for customers to compare the warmth of various pads. Thereby, allowing them to find the right sleeping pad for their needs. To learn more about R-Value and how we measure it, check out our post: What is R-value?.

ASTM standard R Value machine
How Was Therm-a-Rest Involved?
We were one of the founding brands of the ASTM (American Society for Testing and Materials) working group which involved a variety of camp gear brands and retailers. Therm-a-Rest has always been an advocate for using R-value as the most objective way to measure the insulation of your sleeping pad. We’ve used this metric for decades, despite other brands rating their pads with temperature ratings. For more info on why we’ve been using R-value, check out our post on R-value vs. Degree ratings.

What Does this Mean for Therm-a-Rest Products?
The new standard uses a different test protocol and device, which means all of our pads have received new R-value ratings. Our sleeping pad’s R-value ratings did not change significantly, but there are certain trends. For example, many of our NeoAir pads received higher R-values under the new testing standards.

attaching sleeping bag to sleeping pad
Were the Old Therm-a-Rest Ratings “Wrong”?
Not at all. They were merely the results of a different procedure for conducting the R-value test. Our rating did not change much since the ASTM still measures a pad’s insulation using R-value. The fundamental construction of our pads has not changed and they retain the same level of warmth. That warmth is just defined by a slightly different number.  However, other companies may see significant changes as some will be publishing R-values for the first time under the standard.

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