I have a lot of calluses on my feet. im standing probably between 10-12 hours a day. is it caused by my shoes? how can i prevent calluses for good?

Possibly : Can be. Calluses can be formed from several different reasons. I recommend seeing a podiatrist who can help with different treatment options including prescription ointments to custom orthotics. Don't let them go to long without care, they can lead to ulcers.

HYPERKERATOSIS: Calluses form because of pressure and friction. Your feet get a lot of both, and yes your choice of shoes factor in as well. Approach your care accordingly. Decrease pressure with proper shoes, inserts, orthotics, weight control, and time on feet if possible. Friction by proper shoes, socks, creams. Treat calluses with safe paring techniques such as pumice stones and files. Better yet see a doctor.

See a Podiatrist: Calluses are largely dependent on the shape of your foot and the way you walk; the type of shoes you wear also play a role. I would suggest having your feet evaluated by a Podiatrist; you may be a good candidate for custom orthotics.