This is an old thread but I still haven't found a good solution. I have long used the Patagonia sun glove. When walking with sticks, it does not adequately protect the thumb from sun. This glove is made for anglers. When you hold a walking stick, the wrist is supinated and the top of the thumb is directly exposed to the sun.They hold up relatively well for what they are. The seams tend to unravel a bit. I have found they can withstand 3 or 4 weeks of hiking just fine. The newer version has an open palm.
The tops of the thumbs will burn while walking with sticks and the Patagonia sun glove does not cover most of the thumb. Sometimes i wrap the thumb with something (little strip of cloth, tissue, gauze) and tuck it in to the glove.
I am considering taking a merino liner glove and cutting off the fingers at the PIP joint and only cutting off the very tip of the thumb. Icebreaker used to have some in lighter colors...like bright red instead of black. They would have to be hemmed to prevent unraveling. If they were snug enough, they could possibly still serve as liner gloves under more substantial gloves.
When really desperate, I yank my sleeves down over my hands and keep it down over the thumb with my pole strap...less than satisfactory.
I am going to check out some of the gloves mentioned here. IMO, the sun exposure to the thumb remains the issue when walking with sticks. Thanks for sharing.