taipan821 wrote:Thanks for the info, follow up question:

Does anyone have a guide as to which type (2.5 oz, 5 oz etc) fits within the temperature range?

This formula is often bandied around though I haven't found it entirely accurate.

The formula for calculating the temperature ratings for Climashield where Climashield Apex has a Clo of 0.82.

84 - (14 * CLO * X), where the final result is in degrees F, CLO is the CLO value of the material and X is the weight of the insulation in oz/sq yd. With no base layer worn.

If wearing a base layer 70 - (14 * CLO * X) is commonly used.

Mostly I have found Apex to be approximately equivalent to:

2.5oz =10c

3.6oz = 4c

5.0oz = 0c

6.0oz = -3c