How to create a drop down attribute list for an information template?

The business has requested me to create an information template using a dropdown list for users to select their criteria.

Example of the Template:

Glove Size

Select Glove/Sleeve Size: S, M, L, XL, 2XL, 3XL

We want users to be able to select those options from a dropdown list.

When I go to Manage Information Templates to set it up, it isn't allowing me to do a list. I can only enter in data. It shows me the option for a dropdown list but it doesn't do anything but give me a textbox.

Can someone tell me how to do this please or does it only allow for textbox and checkbox only?