Yes. they are great silicone materials, and safe dishwasher. If you would like another bigger silicone sink saddle protector mat 18”long, it is here: https://www.amazon.com/dp/B09TL8L9VG

What is the actual size of the mat and what color is it?

Mat is 12-1/2" high & 16-3/4" long & the color is a medium grey

Does this silicone mat have a heat temperature rating or a maximum heat limit when used as a trivet?

The manufacture list this: Made of food-safe silicone, this mat is heat resistant to 425 degrees and can be used as a trivet.

why is the under side wet or slimy? Is the countertop wet to start with or some how the water seep through the mat surface?

For that price ($15 on 03/15/2016 for just a mat, who's kidding who? Does it come with free Netflix?) you might as well get a cheaper $11.47 real drying rack with a base you can occasionally drain into the sink. Excess water drains into the sink but sometimes you get some water left that does not go on your counter but in the board/base (you disengage the board from the dish rack and use a sponge when you clean up your kitchen).http://www.amazon.com/Sterilite-06368004-White-Small-Ultra/dp/B002QE1D6I/ref=sr_1_77?s=home-garden&ie=UTF8&qid=1458029766&sr=1-77&keywords=dish+drying+rackIf you have to worry about sliminess/moisture and drying your counter top after you air-dry your dishes then that is not a good drying rack/mat.If you have to hang your drying mat to air dry it after you air dry your dishes, that is not a good mat.It would be like somebody telling me I need to clean up the inside of my cloches washing machine after I use it...not a fat chance and it's shiny and clean by itself.Discarding the drier filter's lint is how far I can go (to improve efficiency and avoid clogging and fire).I'm allergic to dust but not to drier filters as that dust/lint clings together and don't get in the air and in my nose.Note:Water cannot seep through a silicone mat.Silicone is both a water and air sealant.It will keep water out but if you have a water leak, it will also keep that water in.Silicone is a food-safe product and is gaining popularity from colorful strainers, soup and pasta ladles, food steamers, ice cube trays, loaf/bread pans, muffin molds... It can withstand 500°F.Silicone is used for electrical insulation and numerous applications for cars and airplanes.It's impervious to microbiological growth.On a household level, it's used to make silicone rubber (like your mat) and silicone caulk (that you might need to re-seal your sink).If you get water under a silicone drying mat positioned next to your sink, you might have a water leakage coming from the sink (the piece between the sink and the counter) and might need to reseal that, the same when you get a water leak because sealants don't last forever, especially when exposed to chemicals in cleaning products.Here's a YouTube video about how to caulk and seal your kitchen sink.https://www.youtube.com/watch?v=8_l4WgJnxGQ

Product Care Instructions	Hand Wash Only
Shape	Rectangular
Pattern	Solid
Manufacturer	OXO Good Grips
Size	31.8 x 42.9 cm
Global Trade Identification Number	00719812031088
UPC	719812031088
Color	gray
Shipping Weight	0.47 Kilograms
Item Model Number	1410880
Item Part Number	1410880
Is Assembly Required	No
Primary material	Silicone
Capacity	31.8 x 42.9 cm
Number of Pieces	1
Country of Origin	USA

OXO Good Grips Large Silicone Drying Mat

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