Great comments, thanks all.
Whatever I decide to use the Costco towels on, I've been wondering which side of the towel I should use. I noticed both sides do not feel the same. Should I use the side that has the tag on it? Or the tagless side?
Neither!
Make sure to remove tags ...
THIS :iagree: WITH!
Seriously, once they are washed, perhaps twice, tags removed, THEN you use them.
When removing the tags get your finger inside the loop first. Then grab one side at a time and give it a sharp snap in one direction, not enough to totally remove it, just snap it good. Then give it another snap in the other direction and usually that side of the tag will pop right off.
Once one end of it is off, just repeat on the other end. Snap one direction, then SNAP in the other an it'll come off.
If you try to remove it all at once, or before it's been washed for that matter, you'll rip the sewn edge right off the sucker!
I have my wife pick up a pack at least 3~4 times a year. Use them for whatever, grade them as they are used to what bin you throw them in. Then after washing I'll grade them again. About half end up good enough to be used on paint again. Not bad at all for a towel that doesn't run but 39¢.
To put it in comparison, the closest towel that you'll find in GSM weight is a lot more expensive, but not constructed the same. The Kirkland's have a thicker backing with shorter nap, where the ones on detailing sites will have a thinner backing and longer nap. They may be a little more 'flexible', but the nap is where it's at!

rops: The 360 to 400 dual nap built like that are pretty decent towels. There is a difference!
For instance, a 360gsm from Microfiber Tech, buying by the CASE, 180 to a case runs more than 2.3 times that. But you've got to want 180 of them. Buy anything from any website, 3, 6, 10 at a time and you'll pay $2.50 ~ $3.50 each for them! Buy direct from China and you'll pay a fraction of that but you'll have to buy not hundreds, not thousands, but TENS of thousands! (
I received a 400 sample back in the Summer that I really like, but they are not on the site.)
Now there is yet another version of a 360/400-ish towel with long shaggy pile on both sides. I don't have any yet, (
waiting on bulk pricing) but they may be a total game changer in the under 600gsm category! (
Some here do, perhaps they'll chime in.) I have some old 600's that are 'shaggy' split pile and they shed like CRAZY! OK for rinseless washes (sort of) but horrible for any wipe down during paint correction or LSP duties.

I just HATE the freaking 'micro-lint' with a passion!