Women's Athletic Thigh Protection Rash Guard Underwear Slipshort (Black) | Undersummers

Athletic Underwear 6.5" Length (Black) Clearance

Size Guide

Athletic Underwear

Better than a bulky bikeshort with a smooth waistband these women's athletic thigh protection underwear slipshorts are made of lightweight cool breathable fabric, cotton gusset, and feature a long lasting seam free inner thigh.

* LIGHTWEIGHT SOFT STRETCHY FABRIC - Our Signature Premium Fabric is lightweight, soft, stretchy, silky and oh-so comfy. It allows legs and clothes to glide without pilling.  96% Polyester/ 4% Spandex, exclusive of trims, cotton gusset. 

*CARE - Machine wash cold, line dry. Once you have slipped on your favorite pair of rash guard underwear, you will want to wear them every day and every night.

* SEAM FREE INNER THIGH -  Superior thigh protection without added friction or weakness. Leg stays put while walking without riding up.  Our designs are made to last.  This is a staple wardrobe piece that you will wear often and for many seasons.

* MULTI-PURPOSE WEAR - Our Shortlettes are designed as a layering piece and to be worn as underwear.  Perfect to wear for sleep or for layering under a favorite dress; our rash guard underwear is thin and lightweight.  Perfect for vacations, walking, the beach, amusement parks, water parks, date night, work, and more.  They are not meant to be worn as outerwear alone.

* DETAILS - Designed by a woman for a woman's body.  Comfort fit wide waistband smooths without being tight.

* NON-COMPRESSION FIT - Stretchy, comfy fit.  Absolutely Not Shapewear.  Made for all day comfort.

* CARE - Machine wash cold, line dry

* QUALITY GUARANTEED -We want you to LOVE your Undersummers garments.  Please contact Customer Care if you are not completely satisfied with your garments and we will be happy to issue you an exchange or refund.  Our Sizing is different.  Please use size chart and measurements for sizing.  

*Cut and Sewn in the USA of imported (Korea) Fabrics.

Final Sale

Type: Athletic Underwear

Customer Reviews
4.4 Based on 187 Reviews
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Melissa S.
United States United States

Odd fit

I found that these definitely fit differently and ran smaller than the original fit. I’m not sure I’ll be wearing them.

United States United States

Almost Perfect

The fit is great, however, it rode up my thighs as I walked. I will stick to the anti-chafing slipshort.

United States United States

Just what I need

So comfortable, especially on long walks. It’s the product that I didn’t know I needed. I was just thinking that I’d like to order three more pair.

United States United States


I ordered the black undersummers althetic underwear. These do not ride up in between your legs! This is great and they are not too compressing. I will order again. Great product!

United States United States

Haven't received my package yet?

Still waiting... I'll review once I get them. Thx.

United States United States

Very pleased

The underwear fits perfectly and is very comfortable. I appreciate that you are also selling masks at a very reasonable price! I bought ten. They are very soft and comfortable!

Beth M.
United States United States

Essential summer wear!

I have been a customer for many years and love Undersummers of all styles. This new style with the athletic length is even better than usual - it is just perfect for wearing under my athletic clothes and keeping everything comfy.

kimberly c.
United States United States


ive tried other kinds of thigh anti chafing products. and honestly, these are the best. i wear them more like shorts instead of underwear, and they are so smooth and dont bunch up

United States United States

Sizing is generous

I purchased size 2X because so many products run small. 2X was way too big. Purchased 4 and opened one to try on. Will have to return the other 3. Quality of material and workmanship is excellent.

United States United States


I absolutely LOVE my Undersummers! Excellent workmanship, super comfortable, and the lace shortlettes are just so cute!

Cammie W.
United States United States

Love ❤️

I absolutely love the Athletic Underwear. I’ve even worn mine with an oversized tank and sports bra to walk in. They are so versatile, no on knows they aren’t actually shorts.

Lisa S.
United States United States

tight waistband

I like these and they are a little thicker than the regular ones, however the waistband is really really tight.

Barbara R.
United States United States

Spring buy

I really like these for sleeping in. I didn't receive the shorter ones like I ordered. These were longer. I kept them anyway.

Janelle t.
United States United States

don't pick this style

The back seams are very uncomfortable. Would not recommend this style although I love all my other undersummers.

Crystal C.

Light and comfy. size was

Light and comfy. size was abit big so they are not Chinese sizes get ur correct size maybe even a size smaller from your normal

Nicola N.

Good sizing and nice finish.

Good sizing and nice finish. but they ride up a bit. I will give them another try.

We recommend ordering based on your measurements
 Size (USA) Waist (in) Hip (in)
Small 30-31 37-38
Medium 32-33 39-41
Large 34-36 42-45
X-Large (1X) 37-38 46-49
2X 39-42 50-53
3X 44-48 54-57
4X 49-53 58-61
5X 54-58 62-66
 Size (USA) Waist (cm) Hip (cm)
Small 76-79 93-97
Medium 81-84 99-104
Large 86-91 106-114
X-Large (1X) 93-96 116-124
2X 99-107 127-134
3X 112-122 137-144
4X 124-134 147-154
5X* Fusion only 137-147 157-163


Shortlettes are generously sized  to hug but not squeeze your curves.  They are not compression and do not feel like nylons/hosiery, shapewear, bike shorts, or compression pants.  Shortlettes are simply comfortable.  They are not made to be tight, feel constricting, shape, pinch, or bind.  The longer lengths allows for maximum chafe protection and comfort.

Correct Fit Guidelines:
✔️ Waist should not roll
✔️ Body should glide comfortably against the skin
✔️ Legs should not ride up while walking

Signs of Incorrect Fit:
✖️ Baggy crotch (too big)
✖️ Running at the seams/Wears to fast (too small)
✖️ Slides Down (too small)
✖️ Legs ride up (too small)

Which is the best fit?

CarrieRae's Recommendations:

Under 5'4" - High Thigh, Athletic, or Classic Styles

Plus Size - Fusion, Classic, or Original Lace

Apple Shaped - Fusion, Classic, or Original Lace

* Order the size in-between your waist and hip measurement.  I.e.  Waist 3X + Hip XL = Order 2X

Pear Shaped - Try them all!

Hourglass - Lace or High Thigh

Slender - High Thigh or Athletic

My Shortlettes fall down, why? Are Shortlettes shape wear? Are they compression shorts?
How are Shortlettes different than other slip shorts or bike shorts? How long do Undersummers products last? Can you let your Shortlettes Show?

Contact Us:  Do you have a question that is not answered here?  Email us at info@undersummers.com and we will respond within 1 business day. 

updated 6/22/20