WATER BOTTLES: Insulated or non-insulated that is the question:

Hello everyone, we need your input!!  Please post your comment.  As most of you know we are not providing cups anymore, so in lieu of that we are preparing to sell customized water bottles.  Here is the question:  Insulated or non-insulated?  The insulated run about $5 MORE, so keep that in mind when voting.  Thank you and we looking forward to responses.  Endurance Coach Ryan T.