I thought the same thing until I actually bought one, (didn't pay $90 though) and you will understand after trying one out for a while. This is not an ordinary poly shirt...mine is nearly 2 years old and has seen hunting trips, camping trips, tree trimming and other things...and still looks new after several washes. As a challenge..just put the Ether Comp beside a Capilene or any other poly shirt and inspect them closely.

I've used both Capilene and this piece by Arc'teryx, but not anymore. When I thruhiked the AT I wanted something warm, durable, and lightweight; so I purchased the Quantum Dry Base Layer from 180s. You know that company that used to only sell the wrap around earmuffs? They've moved into base layers, and have a product that trumps both this and Capilene, while being cheaper than both. Check it out, and a word to the guys at Backcountry... get your hands on some of these things. I'll be the first to give it a 5 star review. http://180s.com/pages/catalog_view.aspx?g=1%2c2&y=4&i=118&c=36

here's why it's $90. Silkweight body that is way more durable against picks and pill than any other silkweight fabric. Lightweight softshell arms/shoulders. this thing will outlast any other lightweight performance shirt because of fabrics and construction. Short answer, Yes it is, and so are you.

I wear it over a light base layer. Does the job well.

Not when Capaline is half the price, my humble opinion.