Thinsulate Temperature Ratings

Thinsulate ratings are measured in grams, by the weight of thinsulate. The 3M website recommends thinsulate products based on cool to extremely cold weather, but it does not list temperature ratings. According to Sierra Trading Post, temperature ratings depend on your activity level, perspiration, health, clothing and exposure time to the cold.

200 to 400 Grams

• Thinsulate with a rating of 200 grams has a temperature rating of 55 to 65 degrees Fahrenheit and is advised for work boots, hunting boots, hiking boots, snowboarding boots and alpine ski boots in cool weather. Boots with 400-gram thinsulate have a temperature rating of 35 to 50 degrees Fahrenheit for cold weather.

600-800 Grams

• A thinsulate material having a rating of 600 grams should be worn in very cold conditions at an estimated 15 to 40 degrees Fahrenheit based on the above ratings for 200 and 400 grams. In extremely cold weather, individuals with light activity should select thinsulate products of 800 grams, having a temperature rating of approximately 20 below zero degrees Farenheit.

1,000 Grams

• Thinsulate products with a rating of 1,000 grams should also be used in extremely cold weather conditions, at temperatures below zero degrees Farenheit.