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R1 Pant - Men's

4 out of 5 stars
3 Reviews
Color:Forge Grey


Size Chart


R1 Pant

Cold weather fly fishing 101: you want the fish to bite, not the cold. So do yourself a favor and layer with the Patagonia Men's R1 Pant.  Constructed using the moisture-wicking and quick-drying RI fabric, these lightweight britches provide just the right amount of warmth, so you don't scare away the fishies with your uncontrollable shivers.


  • A lightweight baselayer to wear underneath your waders
  • Doubles as lounge pant on your off days
  • Designed specifically for cold-weather fly fishing
  • Fully adjustable tie waist band with elastic
  • Two hand pockets keep necessities close by
  • Item #PAT01J8
Responsible Collection
Bluesign Approved, Certified B-Corp, Recycled/Repurposed
93% polyester (41% recycled), 7% elastane
Insulation Weight
2 hand
Claimed Weight
Manufacturer Warranty

Overall Rating

4 based on 3 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 1 reviews
4 Stars - 1 reviews
5 Stars - 1 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

January 30, 2023

This is my third pair.

Size Bought:
5' 9"

These have been my go to pants for lounging around the house. Bought my first pair when they were marketed for fly fishing insulation. Sorry they've been discontinued. Warm and comfortable.

Alan G
4 out of 5 stars

January 25, 2021

Short Drawstring

I've used it once or twice and have initial impressions
Size Bought:
5' 8"

5?8? and 175#. Wear 34x30 in most jeans/pants. First thing I noticed was the drawstring was short, but it is attached in the back so it won?t pull all the way out. Added one of those black pinch adjusters like you would find on a hood, but bigger. Run both ends through and tie an overhand knot holding both. The additional bulk isn?t bad. Inseam feels like 31-32?. I would wash these with my R1 pullovers to reduce pilling and not with regular pants/sweats.

3 out of 5 stars

September 24, 2020

Not perfect, but pretty dang good

I've used it several times
Size Bought:
5' 10"

I?m 5?10, 168lbs and the Medium fits me great. It?s not trim like a standard baselayer, but not super baggy either. I find most Patagonia pants are cut way too big. I was worried they would be too warm because I?m in NC, but they breathe quite nicely. I was disappointed to see how quickly the material pilled up, especially at this price. They are super comfortable, but are lacking a back pocket and zippers on the side pockets. Can?t say they?re perfect at this price, but they?re pretty good.

Jeffrey S