Eric P wrote a review of Houdini Airborn Zip Top - Men's on June 6, 2013
I own so many of the high end merino and polyester baselayers (Arcteryx, Icebreaker, North Face, Mountain Hardwear, Stoic...). The previous review on this Houdini got me curious, and so I bought one.
This baselayer is made of 75% Merino and 25% Silk (the product description forgot to mention that as of June 2013).
I must say, it is one of my 2 favorite baselayers ever, the other one being the Mountain Hardwear with silver fiber that was available around 2005.
This Airborn Zip Top is thin, very breathable, elegant thanks to the silk, and very comfortable to wear.
The fit is great as well. Not too tight, not too loose and stretches well (useful for my belly which has been growing lately!). I am 5'7/145 and the small fits perfectly.
It is very pricey though. But if you have the money for it, then this is definitely the baselayer to buy.