Gutermann MARA 50 thread
Very quick and easy to navigate website
It sews the same as Mara 70 with a 90/14 needle. A little bit harder to thread the needle though. Strength should be better than regular Mara 70, but I have not tested that in any meaningful way.
There's nothing better than Guterman Mara polyester thread in various weights for machine sewing outdoor projects ranging from quilts to hammocks and packs. It's strong, throws off absolutely no machine-clogging lint and it feeds smoothly. It is inexplicably hard to get hold of in Australia even though Guterman holds a large part of the market here for more general purpose tailoring and dressmaking thread. Ask the friendly local haberdasher to order Mara and they have never heard of it! That's why I'm grateful to have Ripstop by the Roll who generally have it in stock and postage times halfway around the world are not too onerous. But it's always worth waiting to get the best thread when working with expensive fabrics. Order a couple more reels when you order your fabric and you will never run out!
I've been sewing cotton fabric with poly or cotton thread for years. This thread, with ripstop, is essentially indestructible. Using a seam ripper I had to basically cut every single connection to get it to come apart, whereas with cotton/poly I can cut one connection and "rip" 10 or so connections. Excellent thread, unless I mess up, in which case... I'd rather have something lighter to tear apart.