Women's 3-Zone Heated Baselayer Bottoms

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$149.99

$149.99 ~~$149.99~~

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Size

Standard

Body Size	Ladies US Size	Waist	Hip
XS	0 - 2	25 - 26	35 - 36
S	4 - 6	27 - 28	37 - 38
M	8 - 10	29 - 31	39 - 41
L	12 - 14	32 - 34	42 - 44
XL	16 - 18	35 - 38	45 - 48
1X	18W - 20W	39 - 42	49 - 52
2X	22W - 24W	43 - 46.5	53 - 56.5
3X	26W - 28W	47.5 - 51	57.5 - 61
4X	30W - 32W	52 - 55.5	62 - 65.5

* The measurements shown for each size refer to body dimensions.

How To Measure

1. Waist

This is the soft area directly above your hipbone but below your rib cage. Start measuring from your belly button, bringing it the whole way around your body.
2. Hips

Measure the circumference of your hips. Starting at one hip, measure over the longest part of your buttocks, all the way around to where you started.
3. Inseam

This is the total length of the leg, starting at the hip, to where the bottom fits around the ankle.

S M L XL

Women's Heated Baselayer Bottoms

Size

$149.99

Select a Size

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3 heating zones located at the left & right knees and lower abdomen
Soft brushed stretch fabric that feels smooth against the skin
Wide high-rise waistband for a secure, supportive fit
Flatlock seam construction reduces friction and chafing
Ergonomic paneling follows the body's natural shape for a streamlined fit
Reflective logo print at the back waistband for low-light visibility
Explore the Heated Baselayers Collection

Women's 2-Zone Qtr Zip Heated Baselayer Top

Women's Qtr Zip Heated Baselayer Top

$149.99

3-Year Limited Warranty on heating elements
1-Year Limited Warranty on battery
Extended FREE holiday returns until 1/15, 2027

View full details

Knee-Focused & Liner-Free Warmth

Built for lightweight warmth and cold-weather layering, the Women's Heated Baselayer Bottoms are a heated baselayer for the lower body, made for skiing, hiking, outdoor work, brisk walks or jogs, and everyday cold-weather wear — worn under pants or outer layers, or on their own as standalone leggings. These bottoms use a liner-free construction to reduce bulk and create a softer, more flexible next-to-skin feel. A 3-zone heating system covers the knees and core, while the streamlined fit makes them easy to layer under pants without getting in the way of movement. Worn with the Qtr Zip Heated Baselayer Top, they complete a heated baselayer set that helps create warmth where you need it most.

3 Heating Zones (Left & Right Knees, Abdomen)

Feature Details

3-zone heating across the knees and lower abdomen, delivering targeted warmth to areas that stay cold during extended outdoor activity.
Soft brushed stretch fabric that feels smooth against the skin, bringing comfortable warmth without unnecessary bulk.
A wide high-rise waistband creates a secure, supportive fit that stays comfortable through extended wear.
Flatlock seam construction reduces friction and chafing, making the baselayer easier to wear for long periods.
Ergonomic paneling follows the body's natural shape for a streamlined, supportive fit that moves comfortably under outer layers.
A reflective logo print at the back waistband adds subtle visibility when worn as an outer layer in low-light conditions.

Soft Stretch Fabric
Discreet Battery Pocket
Reflective Logo

Heating System

Heating Performance

Carbon fiber heating elements
3 heating zones (left and right knees, and lower abdomen)
3 adjustable heating settings (high, medium, low)
7.5 hours of heating (high for 2.5 hours, medium for 4.5 hours, and low for 7.5 hours)

Battery Performance

7.4V output for fast preheating
UL, CUL, CE, FCC, and RoHS certified for safety and quality
Fully charges in 2 hours with a 20W USB-C charger (not included)
Supports faster charging with 24W USB-C power delivery
USB-C charging cable is included
Capacity: 5075 mAh/7.4V/37.5Wh
Weight: 6.5 oz (185 g)

Materials & Care

Materials

Shell: 80% nylon, 20% spandex

Style# FBB-31

Fit and Construction

Fit: slim fit; ankle length
Weight: 15.2 oz (430 g) for size M
Pocket: one outside battery pocket

Care

Machine wash cold
Gentle cycle
Use a mesh laundry bag
Do not bleach
Line dry
Do not iron or dry clean

FAQs

How to choose my size?
We recommend using the size guide (located next to the size options) on the product page to find your perfect size by comparing it to your body measurements. If you need further assistance, please contact us at support@ororowear.com
How can I wear these heated baselayer bottoms?
The streamlined, close-fitting design works well on its own as an activewear-style bottom in milder conditions, while the slim profile also makes it easy to layer under ski pants, outerwear, or other cold-weather gear when temperatures drop.
Can I wear these heated baselayer bottoms on the plane or put them in carry-on bags?
Sure, you can wear them on the plane. All ororo heated apparel is TSA-friendly. All ororo batteries are lithium batteries and you must keep them in your carry-on luggage.
Are the heated baselayer bottoms machine washable?
Yes. They are machine washable. Be sure to follow the care instructions provided. Remove the battery before washing. Machine wash cold on a gentle cycle and use a mesh laundry bag. Do not bleach, iron, or dry clean.

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