NcSTAR VISM Roll Up Shooting Mat https://www.amazon.com/dp/B015I3J16C/ref=cm_sw_r_cp_api_glt_i_NGGKYKR43WVBFV7ZH5C4

Price range would help a bit...

That said, there are 3 things I look for in a mat:
-Padded
-Light color
-Water resistant

Padding because that's what saves your elbows and knees. Light color keeps it cooler in the sun. Water resistant because a soggy mat - whether from dew, puddles or rain - is a slice of misery.

From a quick spin thru Amazon, I liked the NC Star mat for about $35, and the Midway Pro mat for about $60.

I have a similar mat to the NC one, it might be the same but differently branded. It's smaller but big enough, has decent padding, and packs small.

The Midway mat has a rubberized bottom to protect from slipping and moisture, includes stakes to keep it from blowing around, and has a few other features you might get to, like a spot to load a bipod against.

Either is a good choice, it just depends on what you want to spend and what features you'd like.