The above ones look good, but I then found some highly rated (4.3/5) straps on Amazon.
Ordered a black, and orange one (twin pack) for £12.79
Part of a review….
”For comparison, I also own the Ultra Orange, Volt and Electric Blue straps from nomad. £60 each and very well made with FKM rubber. With a pair of these at less than a third I really thought they would be the overly soft stretchy silicone… well, they aren’t FKM but very close so feel every bit as well made.”