I have transitioned to merino wool the past few years, and this Body Tech Top from Icebreaker is a critical base layer for cold weather.

The high adjustable top is perfect for the cold, windy days and if it gets warm you just unzip and open 'er up. The wicking is excellent and if you get a little 'damp', the wool protects you with this miracle natural fiber. One suggestion: they should move to flat seams! At this price level, I don't understand why they do not. This is my second Body Tech Top and well worth the dollars! Double thumbs up recommendation!

I like Merino wool products a lot. This has been mentioned in other reviews and forums. They wick well, keep you dry when wet and have virtually no reek like synthetic baselayers.

A few weeks ago, I purchased two of the Icebreaker Tech Tees and I began to wear them around town. Being that I've worn Icebreaker midweight Zip T's, I was familiar with the quality of the baselayers.

I ordered another Tee, the Hopper, and washed the shirt as recommended (Sport Wash, inside out) and wore it for an eight hour hike and climb of two 14ers and tough connecting ridge. The baselayer worked well to protect me, keep me warm in the early morning chill and dry when I began to sweat in the Colorado sunshine.

The negative that I experienced was the pilling of the upper back of the shirt where it came in contact with my close fitting backpack. After I removed it from the washer and line dried it, I saw this pilling of the wool.

This was the first time I've ever seen pilling after only one time of wear. Perhaps this is attributed to the Superfine wool, I don't know. I have two other Superfine shirts that I doubt I will wear with a backpack. This goes against the nature of the baselayer and I'm at a loss as to what to say or write.

I like Icebreaker and will continue to use their baselayer wools. I returned the Hopper for credit and kept the other Tees. I also informed Icebreaker as to the problem.

I've been transitioning away from Capilene and synthetics the past few years and wore an Icebreaker Tech Zip T 260 wt. (midweight) most of the winter and early spring. I was so impressed with the comfort and durability of the fabric that I just had to try the merino wool Short Sleeve Tech Tee.

I ordered two and lo and behold these are incredible baselayer/active tee shirts. They are incredibly comfortable and the 190 weight has some 'added' process which makes the fabric smooth and comfortable with incredible wicking and NO STINK.

Being that the Tech Tees worked so well, I recently ordered an Icebreaker Hopper Short Sleeve T-shirt and am awaiting its arrival.

Not only do I like high quality merino wool for climbing 14ers, snowshoeing, backcountry hikes and climbs, I also enjoy wearing the fabric around town. I am a total convert to merino wool and especially the wools from Icebreaker!

The concept of a lightweight, breathable, less stink synthetic shirt from top manufacturer Patagonia made a lot of sense and caught my attention. However, the end result doesn't work.

Why did Patagonia create all of those flat double stitched seams on the shoulder area and in the upper back? Probably to connect the two different fabrics together. The negative to this is that the seams get in the way big time with a pack and the skin begins to chafe where it makes contact to the seams.

The Airius T does in fact breathe very well. But after ten days in three shirts (machine washed) of climbing 14ers, running and just plain old exercising, I began to see that these shirts are made for walking or running without a pack on.

The fabric does not stink as much as the Strider T's but it's not as stink-proof as an Icebreaker Merino wool.

The Airius Ts are nice lightweight shirts, but they're not meant for anything that has to do with carrying a pack or for an activity that's rough on the fabric.