Why are customers adding to cart but not purchasing on my new online store?

[hmboots]

Hi there, I started my shop 2 or 3 days ago and have had around 100 visitors. I have had around 15 of them add to cart and reach the checkout but none have bought any of my products. I know this could just be a preference of theirs but I was wondering if anyone could check my website and tell me if anything is wrong with it?

the link is: hmboots.myshopify.com