<ul>
  <li ng-repeat='shoe in shoebox'>
    <input type='checkbox' ng-model='shoe.selected' id='shoe-{{shoe.name}}'>
    <label for='shoe-{{shoe.name}}'>{{shoe.name}}</label>
  </li>
  <button ng-click='whatIsChecked(shoe.selected)'>Apply</button>
</ul>

$scope.whatIsChecked = function(selectedThing) {
  console.log(selectedThing);
};