They offer a variation called the ultralight http://www.sierratradingpost.com/sma...colorFamily=03

(this happens to be a compression version but they offer "regular" as well)

My husband and I have some similar to these: http://www.sierratradingpost.com/sma...colorFamily=01

Lots of options at Sierra Trading Post - I get all ours there, esp when they offer a 40% discount coupon on their facebook page.

Also on STP, Icebreaker offers lite merino wool socks too http://www.sierratradingpost.com/ice...colorFamily=03