For radio buttons and current version of iCheck:
<div class="row">
<div class="col-lg-1">
<div class="form-group">
<label>
<input type="radio" name="my-radio" class="flat-green my-radio" value="true"> Yes
</label>
</div>
</div>
<div class="col-lg-1">
<div class="form-group">
<label>
<input type="radio" name="my-radio" class="flat-red my-radio" value="false"> No
</label>
</div>
</div>
</div>
JS:
var isChecked = $("input[name=my-radio]:checked").val();
It will return undefined if no option is selected, true or false if selected.