If you don't find one used, consider Hilltrek in Scotland. Their double ventile or cotton analogy are both excellent and waterproof. I can't remember if Riv's offering was double, single, or a blend (double shoulder and arm?). Whatever it was, Hilltrek has a parallel. I love their cotton analogy (single ventile with an inner liner than mim ics the natural wicking of vapor and liquid out. Their lineup is a bit confusing at first, their workmanship is excellent and everything we've gotten from them is lasting beautifully under significant use. https://hilltrek.co.uk/
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