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Less weight, greater breathability, and superior temperature regulation! The REACTIV™ Lite Grid Bottom uses high-tech, graphene-infused fabric that expertly retains or expels heat as your body demands. Soft, next-to-skin comfort, built-in odor resistance, and unparalleled layering performance. NEVER SETTLE™
Polyester
Style Number:
5307
What is Graphene?
Graphene is both the lightest and most conductive material known to man, with natural odor-resistance. Simply put, graphene rapidly absorbs and redistributes heat faster for more efficient thermoregulation. Its superior breathability keeps you at the ideal temperature in a wider range of conditions.
As the lightest, fastest cooling, and best temperature-regulator on the planet, Graphene disperses excess heat quicker than any material known to man.
Grid patterning expertly wicks excess moisture from skin, promotes heat retention, and improves compressibility. Graphene-infused yarns provide built-in odor resistance that never washes out.
Two weights of high-performance fabric provide warmth where you need it and breathable freedom of movement where you want it.
4.0
Allin
Verified Buyer
Activities:
Outdoor
Height:
5'9 - 5'11
Experience Level:
Casual Explorer
Was so thrilled at how comfortable these are. Much more than I’ve ever experienced before. I’m so glad that I gave them a try before I head to Iceland for a trip.
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0
0
Jeff
Verified Buyer
Activities:
Active, Outdoor
Height:
5'9 - 5'11
Experience Level:
Expert of the Outdoors
Great pants!! I suggest going an inch larger on the waist size. My only regret is, I wish you had them in the green camo color in the same size 34X32. I’ll keep looking for them. It says you’re out of stock.
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0
0
Sam
Activities:
Travel, Active, Work, Lifestyle, Outdoor
Height:
6'0 - 6’2
Experience Level:
Casual Explorer
I purchased these at the start of fall and have been enjoying them ever since! Living in the Midwest, I wear these almost everyday. They are GREAT for temperature regulation and an excellent base layer. My only gripe is that, with a 34" inseam, these do run a bit short and come up an inch or two above my ankles. Maybe a "long" or "tall" varian...
Comments (1)
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1
0
Customer Service
11/12/2025
Thanks for the feedback! We'll make sure it gets passed on to our design team for consideration.
Colby
Activities:
Active, Lifestyle
Height:
5'6 - 5'8
Experience Level:
Casual Explorer
When I heard these were coming out, I was beyond stoked! I ordered the Fleece Reactiv and love it, so I ordered the base layer bottoms from REI. They do exactly what they promise, and they work so well from indoors to outdoors, up here in south-central Alaska. My gripe is with the durability. The thin parts of the fleece have been peeling into...
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4
0
Kate
Verified Buyer
Activities:
Active
Height:
5'6 - 5'8
Saving for freezing weather suspicious will be tested
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0
7
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