SALOMONMen's X Ultra Pioneer Climasalomon Waterproof Hiking Shoes Trail Running

Q: should I choose a 1/2 size bigger when selecting size.So if ki wear a 9 I should order a 9.5?

I think you should. I normally wear a size 12, but it was a bit too short. Also, I have narrow feet and the normal size was too tight and they did not have it in wide.

Q: How much does this shoe weigh?

A simple Google search says 409 grams. This is from Soloman's site directly and is listed in the data sheet here on amazon.

Q: How to buy the European size 45? Size 11- 44, size 11.5 - 46. I bought both. These don't fit.

I typically wear a size 8. I bought a size 8.5 and it perfectly. Snug but comfortable.

Q: What is the heel drop on these?

I haven't experienced any problems with heel drop as long as you tie them securely and add an overhand keeper knot. It's a hearty hiking and work shoe.