These are the only tubes I ever use since I discovered their existence 7 or 8 years ago...They are Slime filled and I used them in conjunction with kevlar reinforced Bell tires.
I have road hazards, goatheads, mesquite thorns, and tumbleweeds everywhere here in the high desert...I have not had a flat or even slow leak since I started using this combo...With regular tubes and tires, I was lucky if they lasted three days, hence my search for better...lol.
https://www.amazon.com/Slime-30046-Self-Sealing-Schrader-1-75-2-125/dp/B000ENQRCI
https://www.amazon.com/Bell-Comfort-Glide-Bike-Tires/dp/B07PKDL4LZ
The tires are almost 10 dollars cheaper at Amazon rather than Walmart.