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Thanks for your question. Sounds like an incredible trip! Can you tell me when your adventure is taking place? If it's coming up soon, it looks like you can rely on hot and dry (80's-90's) tempuratures around the Salt Flats. Don't forget your 10 Essentials!
If you're going to be doing a lot of walking, clothing with quick-dry capabilities and UPF protection will help keep you comfortable. I would recommend a long sleeve button down (the collar also acts as some neck protection) and synthetic pants. I'd also look into a wide brim sun hat and/or neck gaiter. They'll provide shade and when you need it, you can wet the neck gaiter to keep you cool.
We also have some great specialists in our stores who can help get you set up with all your clothing details. Have you considered a personal outfitting session? They are a great way to get some dedicated 1:1 time with an REI employee. You can check out our outfitting scheduler, here.
Hope you have a great trip!
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