I tried the nsk24 XL but they were too small for my large hands. I went with the 720 XL and they were much better. I later found some XXLs which I use now. They fit perfectly with Xerotherm gloves inside.
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Finally dove the 720 in the ocean today. I dove with one of those and one Ansell G17K (black latex "dishwashing" glove). The 720 was warmer and it was superior in wiping snot off my face after the dive because of the texture. The Ansells are useless for snot-wiping. (TMI?) I had been worried the 720 would leak but it did great.
I told myself on the last dive of the day, I'd try the 720 with no liner since SeaJay recommended it. But, I wimped out and didn't. Another day maybe.
I still find myself pre-cringing for that rush of cold water when I reach back to dump my wing. Every time I am pleasantly surprised there isn't one.
On the first dive, I didn't put the edges of my undergarment under my wrist seals, and I was planning to be able to equalize the gloves just by moving my wrists, since that always used to let cold water up my sleeves. It didn't work, though! We went to 100 feet and my hands were pretty squeezed. It wasn't too uncomfortable and I could still use my hands, but for the next dive I went back to putting some of the undergarment cuff under the seals. I've tried straws before and found them uncomfortable and pokey.
So I'm a 720 convert! It was so nice to get that pair of gloves for FREE! Thanks for all the tips SeaJay and everyone.