I'd read so many good reviews of Icebreaker wool shirts besting synthetics, I was expecting a lot. And it delivered. Wore this for 3 days while re-enacting a Mormon pioneer hand-cart trek in the middle of Wyoming. Kept me warm-ish when the winds and chill crept up, but when it was hot, it kept me just cool enough. Never stank. Did develop some salt stains, which I'm not used to. But that's probably because I've never been able to wear a shirt this long. The synthetics would smell so bad after one day, it was unthinkable to wear more than once. Being able to wear a shirt more than one day will alllow me to cut down on my base backpacking weight. So overall, I'm thrilled.