I'm wondering with the large mug + 17 oz it could be a little heavy to lift. What is the weight of the mug?

I am approaching 80 & lift this puppy with my left hand. These mugs are the greatest ever....bar none. Now go buy a pair, U won't regret it !

From frequent washing, even hand washing, has anyone experienced loosening or breakdown of the silicone sleeve?

I haven’t owned mine very long (maybe a month) and I always hand wash. The quality seems superb and based on its current condition, I don’t anticipate the silicone drying out or cracking or otherwise being damaged anytime soon, if at all. These mugs are the only ones I use now and beside of the flat bottom work perfectly to keep my beverage hot when used with my mug warmer. I don’t regret this purchase at all. Word of caution...DO NOT hold the mug by the bottom (fingers underneath) when pouring hot liquids in it. You will get an instant burn.

Do these cups come with any lid?

Yes, every mug comes with a lid, and there is an opening on the lid for putting your stirring spoon or straw. It is quite convenient to use. Hope this helps!

Reusability	Reusable
Material Type Free	BPA Free
Product Care Instructions	Hand Wash Only
Material Features	Insulated
Material Type	Stainless Steel
Item Weight	481.94 Grams
Number of Items	2
Item Dimensions W x H	12.99"W x 17.13"H
Unit Count	2.0 Count
Capacity	1.1 Pounds
Shape	Round
Pattern	Solid
Theme	Winter
Occasion	Vacation
Color	Black/Blue
Style Name	Coffee Mug
Additional Features	non slip

COSORI Coffee Mug with Lids Set of 2, Stainless Steel Cups with Heat-resistant Handle & Slip-resistant Sleeve, 17 oz, Best Match w/Mug Warmer, for Coffee,Tea,Water,Cocoa, Milk, C1601-CM, Black & Blue

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