ASP.NET MVC CheckBoxList from model with List Property

Apologies if the title is unclear.

I'm trying to return my model from a form submit in ASP.NET MVC.

My question is nearly the same as this question, only differing in that I don't have a List<Model> but a model like:

public Model
{
     string UserName {get; set;}
     string Password {get; set;}
     List<Roles> UserRoles {get; set;}
}

where I need the UserRoles as checkboxes that the admin can select from when creating a new user. My question is, I'm unsure how to use a '@Html.CheckBoxFor' against a list. I tried this:

 @for (var i = 0; i < Model.UserRoles.Count();i++ )
 {
   @Html.HiddenFor(model => model.UserRoles[i].RoleID)
   @Html.CheckBoxFor(model => model.UserRoles[i].Selected)
   @Html.LabelFor(model => model.UserRoles[i].Name)
 }

which in no way worked - every label on the page is "Name", and my List was empty in the POST. Can anyone offer me any guidance on this?