35-55 degrees this jacket rules period>> - Mammut Eigerjoch Pro IS Jacket - Mens

Purchased in Large, which i usually go with when purchasing Mammut Jackets as they run a tad smaller than what i'm used to seeing available from other companies who sell products in the usa but are based overseas like mammut who stick with euro sizes more or less.

Jacket is superb materials, very elegant design, simple and nice fitting when wearing thin layers of clothing underneath, i'm 5'8 and weight 135lbs. The Medium jacket was way too tight for my comfort zone when wearing particular clothing underneath this jacket.

Fit is in between regular and athletic fit, which is somewhat rare but fits great on me.. Wish mammut would offer more jackets in this particular fit.

I can wear a midweight baselayer and this jacket and be comfortable in temps that range from 35 to 50 degrees and remain very warm as long as i'm active. a thick heavyweight base layer and this jacket and i'm fine in those temps outside.

I love this jacket and just about every jacket i've bought from Mammut over the past 3yrs.. I usually wait for jackets from last season to go on sale before buying, unless i want it and accept to pay a premium price, due to the high quality and long lasting outdoor quality jackets Mammut has available.