Size

Customers are pleased with the size of the SUNWILL Coffee Tumbler Cups, finding them portable and suitable for carrying standard cup sizes. Some mention that they come in various sizes to fit different preferences.

Insulation

Customers generally praise the insulation ability of the tumbler cups, keeping their hot or cold beverages at desirable temperatures for extended periods. Some express satisfaction with its ability to maintain temperature even when shaken or thrown around. However, a small minority have reported issues with the insulation not being as effective as previous products they've used.

Ease Of Cleaning

Customers generally find the tumbler easy to clean, with some mentioning its simplicity as it only having a few parts. The ease of cleaning is appreciated by many and has been reported to work well in various settings including cars and offices. However, there are conflicting instructions regarding dishwasher safety.

Leakproof

Customers have generally positive feedback regarding the leakproof feature of this insulated coffee tumbler. While most reviews praise its ability to prevent leaks, some mention that it's not completely leakproof when overfilled or tipped over. The lid design is appreciated by many for its secure sealing and sturdy plastic construction.