Talk:FAQ/@comment-220.255.1.111-20131101085121/@comment-5.68.231.52-20131101133724

Generally new items will unlock as you reach certain levels, usually levels 14, 28, 42, 56, etc.

Take a look at the Equipment section and scroll down to 'Unlocking Gear', that will tell you exactly when new items are unlocked in the shop. They will also unlock at waves 5, 10, 15 and 20-21 of the Eternal Battle.