Frye Boots Too Large

Hello,

I purchased some new Frye moto harness boots a few years ago. They’re a bit too big, I bought a 9.5 (my shoe size), and they have too much room, more towards the heel. I’ve had them sitting in my closet for almost 3 years now, I don’t want to part with them and I really want to make them work, but they keep slipping and dragging when I walk. I bought insoles and put them in there, but they’re still a bit loose. Any suggestions on how to get them to fit?