I have a wide range of merino wool apparel, including socks, underwear, base layer, mid-layer, top layer, glove liners, neck gaiter and hats.
Recently, I've added to my collection with the IBEX Indie T-neck, which I now wear to the office routinely. Casual/dress, comfortable and good looking.
The wide temperature range, and yes, the fact that they have an extended use/wash interval are strong attributes.
I own Smartwool, Icebreaker and IBEX. IBEX has, however, become my preferred vendor and all of my merino purchases for the past 12 months have been from IBEX. In addition the IBEX quality, styles and customer service, a very important facet is that most of their merino wool products are made in the US in New England (using NZ wool). Supporting our local economies is critical if we are to have a sustainable future.
And, no, I do not work for IBEX. But I sure do like their products!