Yoga mats work great for that.Walmart 6mm extra think yoga mats... that's my go to.
I use Harbor Freight anti fatigue mats. Comes in a roll sized 72”x24” and it’s 8mm thick for $10. They also have a 30% off coupon for items under $10 that ends today.
Anti-Fatigue Roll Mat
Amazing deals on this Anti-Fatigue Roll Mat at Harbor Freight. Quality tools & low prices.www.harborfreight.com