ARE YOU SERIOUS???
1. Wrong forum
2. 26.5-28= 3 shell sizes = 20+mm from largest to smallest, I don't care how thick your socks are...you can't fit in that big of a range.
3. Go to a ski shop and get yourself fitted properly so you arent swimming in your boot or aren't in constant pain
4. After going to the ski shop and figuring out your actual size, you may also find out that full tilts are NOT the right boot for you, just cuz they fit some poeples foot, doesn't mean they fit yours
5. Try making this thread again, in the right place, with the correct boot size, company and model for your foot shape and size