In reply to Bamber85:
I am a 39 every time in Solutions but need 39.5 in Speedster and its looking like 40 for Genius but I have yet to try them on with feet "cold" I.e. not after several hours climbing on the wall!
For comparison I always took UK7 in 5.10 velcros, pinks, greens, whites when I used to wear them.