This fully depends on the shoes you are buying. The types of shoes you buy will depend on the type of climbing you are doing.
Shoes are made on two types of lasts basically: a “board lasted” shoe which is made on a stiff supportive insole and a “slip lasted” shoe which is more of a sock style last.
Both types of lasts have their place where performance is concerned.
Trad climbers (and big-wall) tend to go for a more supportive shoe on a board last so that the foot doesn’t tire out over long, grueling, multi-pitch climbs, whereas sport climbers, boulderers and indoor wall climbers tend to lean toward the softer, slipper like slip lasted performance shoes.
Board lasted shoes will rarely stretch much so they are fit closer to your street size. A slip lasted shoe is often softer and more supple and can stretch (at times a lot) so they are fit up to 3 sizes smaller in some cases.
All of the above is then also affected by the lining in a shoe, the manufacturers sizing anomalies, stretch of surface materials and preference.
To get an ideal fit you need to try your shoes (try if you can to get to a store and boulder around on it), talk to folks (who have them) about their fit and make a decision based on a lot of research vs. a hasty one. You don't want them to end up in your closet!
Check out this site for more info about rock shoes:http://www.climbing.com/print/equip...
answered 3 years, 2 months ago