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Are these Dishwasher Safe?
Yes, Kitchables double wall coffee mugs are dishwasher safe, However for longevity of our lovely coffee mugs we recommend hand washing.
Why is there a small hole in the bottom of double-glass cups?
The small hole at the bottom of double-wall glass coffee mugs serves a specific purpose. It is called a vent hole or a relief hole, and its main function is to equalize the air pressure between the two layers of glass.
How many glass cups in this set?
Kitchables Double wall coffee mugs comes with either set of 2 or set of 4, depending on the size variants
How to properly take care of our lovely double wall coffee mugs
To prolong the life of your double-wall coffee mug, here are some tips to keep in mind:
1. Hand washing instead of dishwasher as dishwasher can subject the mugs to excessive heat or which may weaken the glass.
2.Avoid extreme temperature changes
Important information
To report an issue with this product, click here.
Hobson –
I bought these 12oz double walled glasses because I wanted something to keep tea hotter longer at work. I liked the look of them on the product page, and the 4.5 star reviews gave me confidence in spite of a number of complaining reviews. When I opened the extremely well packaged box, I was very pleased at how attractive they were out of the box, and they certainly made my first cup of tea even more attractive.The first time I used one I noted that it did keep tea hot longer, but not as long as some of the claims in various reviews. Nor did the tea grow instantly cold as some nay-sayers claimed. Out of curiosity,I decided to test both new Kitchables cups against my favorite 12oz medium weight ceramic cup with a handle to see how much difference there really was. I tested both new cups for consistency.I began by ensuring the volume was identical. I used a Pyrex 500ml/16oz measuring cup for this & discovered that all three cups hold 12oz liquid with approx 1/8 clearance at the rim.All three cups were tested at ambient temperature and were at 69 degrees Farenheit. I used an infrared thermometer to measure the outside & inside temperature of the cups before filling (Etekcity Lasergrip 1080 Infrared Thermometer, purchased on Amazon). During the test the cups rested on identical wooden trivets to ensure any heat transfer at the bottom of the cup would be minimal and as similar as possible. To measure the temperature of the water, I used a mercury bulb thermometer I’d had around for a while – faster and more accurate than most instant-read thermometers for this sort of work. During the test I kept the thermometer in hot water that was cooling at roughly the same rate as the cups in order to avoid introducing heat or cold into the first cup I measured. I began by boiling water to a full boil. The temperature was 210 degrees (mercury bulb thermometer) when I poured it (212 is hard to reach and depends on altitude and barometric pressure). I filled each cup to the 12oz mark and measured the outside temperature of the cup with the infrared thermometer. I then checked the water temperature and outside temperature of each cup every 5 minutes for 30 minutes. I discovered that (as expected) the two double-walled cups measured almost identically through the entire test, so I will report them as one cup for convenience.At 5 minutes: glass cup water was 170 degrees, outside was 110 degrees (comfortable to hold); ceramic cup water was 160 degrees, outside was 146 degrees (not comfortable without the handle). 10 minutes: glass cup was 159/107; ceramic 151/138. 15 minutes: glass cup was 145/102; ceramic 140/130. 20 minutes: glass cup was 141/100; ceramic 134/122. 25 minutes: glass cup was 135/96; ceramic 125/116. 30 minutes: glass cup was 126/94; ceramic 120/112.Clearly, the double-walled cups kept the water warmer longer but after the initial 5 minutes they lost heat at approximately the same rate as the ceramic cup. This could be due in part to the fact that the glass cups had a larger diameter at the top than the ceramic cup (3″ compared to 2.5″), and so they lost more heat from the larger surface area; also using the trivets may have decreased the heat loss from the wider-bottomed ceramic mug (as might have happened during real-life usage).The initial heat loss was less with the glass cups, likely due to the fact that while the double walls may contain only vacuum as advertised, heat conduction through the continuous glass walls of the container would be less than the solid ceramic walls of the other cup. A matching glass lid would probably help the glass cups retain heat longer, just as keeping the lid on your vacuum-sealed travel cup will. Out of curiousity, since at work I microwave the water inside the tea cup, I tested a glass cup by filling it to 12oz and microwaving it to a visible boil. When measured, the water was at only 205 degrees (any physics expert who can explain that is welcome to weigh in, because I’m curious about that). However, the outside of the cup was at 125 degrees and decidedly uncomfortable to the touch, probably due to the water conducting heat to the glass while it heats. Obviously, though, the beverage would stay hot longer simply because the cup itself wouldn’t be cooling it down as soon as the hot liquid is poured into it. And, similarly, preheating the cup with hot water before adding your hot beverage will allow the beverage to be hot longer. So what do I take out of all this? These are attractive cups, although as others have noted they are better for a person with a large hand (me, for example). They keep the beverage warm longer but not profoundly longer, because they are not sealed vacuum bottles or travel cups. Still, if the beverage is still warm 30 or 40 minutes after pouring it instead of feeling cool, that’s a win and these glass cups look a lot nicer than the travel mug of your choice. They are very nice to have room temperature water in and guests to my office appreciate a glass rather than a paper cup. Downside: they’re tricky to microwave in, because using a hotpad to take them out of the microwave feels insecure on the smooth glass. Because of this, a silicone hotpad might be better than cloth, although I haven’t tried one yet.Comments on selected review claims and complaints: 1. They will not keep your coffee hot for an hour, nor will your coffee be cold in 10 minutes. 2. They hold a full 12oz with room to sip. 3. They are not exceptionally fragile. However, when you drop glass on the floor or table, or click glasses with any force at all, it can break. I’ve had mason jars collapse in my hands just by touching them together – and mason jars are tough.Would I buy them again or recommend them to a friend? Yes. Even though they don’t keep my tea hot as long as the ridiculously expensive name-brand travel mug of your choice, they’re very nice glasses too look at and to hold..
jenniferlivengood –
These are Large and lovely. Arthritis makes it hard to manage a heavy pottery mugs I usually use but these light and the handle is comfortable.I love that I can see the beautiful layers of coffee, crema, froth, matcha or tumeric colors I add.It holds as much as I like to make in the morning.I haven’t had ice for cold coffee yet but I have microwaved it 60 secs. to warm it up and my used mini whisk in the cup without issue.They feel good in my hands. Very nice buy.Sturdy, light and huge.
Steve S –
I’ve gone through lots of insulated glass mugs, they usually break through the bottom. This glass has held up well.These make quite a presentation for lattes with coffee cascading down the milk.The only drawback is they are a bit large diameter fir small hands.
Jai Flicker –
These insulated coffee mugs are nice and large, which I like. Highly satisfied with them. Definitely recommend.
Scott Carle –
I’ve been using these for about 2 months now. Both hand cleaned and dishwasher cleaned and they have held up well. The double wall design holds heat in and makes it comfortable to hold very hot drinks.When I got them I was a bit disappointed at the smaller than expected size. I should have looked at a 10 or 12 oz size. also the glass is thin. These are very very light and delicate. However I haven’t really treated them with any extra care and they seem pretty durable and tough. Haven’t dropped one yet. Still don’t think it would survive even a minimal drop on a hard surface.The only negative that would make me unlikely to purchase these again is that the shape on the inside bowl is very rounded on the bottom and it makes the contents very easy to slop over the upper lip with minimal movement of the cup if you fill it up. Even if I leave an inch of space from liquid to lip I can still spill it just picking it up from the counter due to how the rounded bottom and sloped side allow the liquid to move.This cup has a nice handle that even someone with decent sized hands could use, but the overall size of the cup even with the double wall design would still be comfortable with someone with smaller hands to hold.Oh and we stack these one in the other two high or even in a regular cylindrical mug and then two of these on top in our kitchen cabinet and it has worked well with no damage to any of them.My wife loves them and would disagree with my comments on the capacity and and how easy it is to spill.
Lively –
Classy presentation. Sturdy foam packaging. These 20 oz mugs would be a great gift and will keep my coffee and tea hot for longer. You won’t be embarrassed to have these delivered sight unseen. I have trial ordered gifts online before and sometimes the product is very shoddily made. Not so with these glass items.
Claudia Rosela Guerra Espinoza –
Tazas
Muy lindas, aislamiento de calor, se ven preciosas, tamaño pequeño ideal para té
Olga –
Son muy pequeñas para mi gusto
Me hubiesen gustado más grandes
Jennifer BrownWarne –
I love this product!
I’m not going to lie, at first I was terrified to pour boiling water into this glass. Because it LOOKS like a glass & not a coffee/tea mug.Thank goodness I got over it. This is, bar none, my most favorite “mug” now. It gets warm without being scalding hot, like my other mugs do. I can comfortably hold it without burning myself.It’s beautiful, I love being able to see my liquid as well.I drink a lot of herbal tea & with a regular mug you don’t get to really enjoy the beautiful colors.
Jason Wong –
Need a replacement glass
I do really like these glasses but one out of four of them gets water trapped inside the wall. The liquid moves around and you have to shake it all out which takes awhile. It definitely has a flaw. Would really appreciate a replacement from the company. It’s hard to serve with an incomplete set.