Just a skirt that offers rain protection. ZPacks, Lightheart, and a few other companies make them. I made one with 2mil poly and Velcro. It was nice but I ditched it and just used quick drying running shorts. There's also instructions on here somewhere to make one out of Tyvek. Actually ended up not using rain gear at all unless it was cold, but it's definitely a better option then rain pants due to ventilation.
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