- 5,850
- 2,770
- Joined
- Feb 15, 2016
From my experience, .5sz down is not really necessary and staying to your UB size is fine.
Just got my Uncaged Ultras, went half size down and had to remove the insoles so they could fit
2 major factors would be how snug you want the sock to be and the other if you truly know your shoe size.