Sea To Summit – Delta InsulMug

Performance on a budget

When looking around for a cup there are plenty of options. Materials from titanium to plastic, sizes from a few ounces to several cups, and don’t even get me started on designs.

For my use I was looking for something in the 8-16 ounce size, lightweight, durable, insulated, and budget friendly. The Delta immediately caught my attention as it fit all of my criteria. It has a very sturdy construction, has a built in cozy to keep the skin on your hands from melting off, and it claims to hold 16 ounces of liquid. All of this is packed in at a reported 4.4 ounces and only costs $15.95.

First we will start with the easy stuff. It weighs in at 4.2 ounces on my scale, giving them .2 ounces of room to play with. It will hold the advertised 16 ounces of liquid, however it brings it right to the limit. If you have some hot liquid in there and make any sudden movements you may not be so happy. I would say 12-14 ounces works perfect, and for most applications (tea, coffee, cider, coco, etc.) that is plenty. I have read reviews that there were problems with the lid fitting properly, between the group we now have 6 of these and none of them have an issue with the lid that I am aware of, so I think they must have fixed this. The lid is nice, it fits snugly to the mug and is comfortable to drink from, and in my personal opinion it is thick enough to provide some additional insulation. The “ThermoSkin” (cozy) is removable, however I do not see the reason for removing it. I would actually prefer if it was permanent as it would reduce the areas for dirt and grime to sneak in and make cleaning a little easier. I can hold the mug in my hands without any burning or games of hot potato even with extremely hot water poured in (upwards of 200 degrees F). A nice perk is that it fits well in your hand as well, it is not awkward to hold.

"Protex" Base

One of the more gimmicky things would be the “Protex” base. They claim this reduces surface temperature, but by the looks of it I would more so believe it provides some additional protection to the mug from use and abuse as well as maybe some grip in case you are trying to balance it on a slope for some reason? I think it probably did allow them to make the base of the mug slightly thicker, thus more durable, and still keep the weight manageable so for that I will say it does its job, but I am not sold that it is really worth marketing the way they have done, making it sound like some type of technological advancement.

So far so good, it has really met all of my needs. Now its time to crunch the numbers and really see if it performs. I ran 2 controlled tests for 30 minutes each. I started with a pretty strong boil and began measuring at 194 degrees. There was no special “sciency” reason for this other than by the time I got everything set up and my timer going the water was 194. The first 20 minutes were measured in 1 minute intervals and then 5 minutes at 25 and 30 minutes.

At 60 degrees ambient temperature there was a 1.76 degree temperature change each minute. There was a sweet spot around 160 to 170 degrees that seemed to hold temp a little better, but this was marginal. Where as at 38 degree test the average temperature change was closer to 2.16. This has far surpassed my expectations, and at even near freezing temps you can expect to have a nice hot drink for a decent amount of time.

6Pack Promise, we highly recommend the Delta InsulMug by Sea To Summit.

Have you used this mug, do you have one you really like? Let us know!


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