But it also says very clearly on the home page:
"Ventile® is not coated or laminated yet the combination of the dense weave and the swelling properties of the fibres when wet provide excellent weatherproofing."
It's interesting. My TTS is 10.5.
I have a pair in 10 of the 1Ks that I had to put an insole in as they were to big.
I also got a pair in 9.5 that fits snug but is comfortable.
It might also be a matter of foot width.
And I wear relatively thick socks in them.
I'm not sure if you're referring to the exact number 16 or- as I think- to a higher weight denim: Cone produces 16.5oz denim for Tellason: http://www.tellason.com/shop/tellason-denim/john-graham-mellor-slim-straight-165-oz