Navy Under Dress Shorts | Cool Anti-Chafing Slip Shorts

Fusion Shortlette Anti Chafing Slipshort 9" Length (Navy)

3/$90 - Any 3 Reg. Priced Fusions - Code: FUSION3

Size Guide

-The Original Shortlette®️-

Small Details Make the Difference

Undersummers Fusion Shortlettes®️ Anti-Chafing Navy Under Dress Slipshorts

  • High waist & long leg gives this maximum comfort, protection, and coverage
  • Seam-Free Inner Thigh offers superior thigh protection
  • Stay-Put Leg keeps your legs protected during activity
  • Front seam flatters your curves
  • Soft, silky fabric lets legs and clothes glide
  • Lightweight, cool, breathable, moisture - wicking fabric
  • Cotton liner makes this a single layer solution
  • Stretchy, comfy fit.  Absolutely Not Shapewear.  Non-Compression fit.
  • 96% Polyester/ 4% Spandex, exclusive of trims, cotton gusset
  • Machine wash cold, line dry
  • Assembled in the USA


Type: Fusion Shortlette

Customer Reviews
4.8 Based on 152 Reviews
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Jodi R.
United States United States

I love every single one that I have bought

I love the new Navy Blue! Perfect for all of my blue dresses! Blue is my favorite color. I love all the under summers that I have bought. I am about to buy a pair for a friend of mine now, as a gift!!

Undersummers by CarrieRae Fusion Shortlette Anti Chafing Slipshort 9 Length (Navy) Review
United States United States

Love Them

Love them is all i can say.

Aurora H.
United States United States

easy win

These are great. The elastic is light weight enough that it doesn't pinch or make lines and the cut is high so I wear them at my natural waist so they don't rolldown. These are so nice and slick and really keep the chub from rubbing. I hiked all weekend in a dress! As a 3X-in-Florida, that simply wouldn't be possible. They are definitely intended as underoos. They aren't opaque enough to be worn as shorts. And they mean it when they say they aren't shapewear so if you're looking for control go for a different product. seriously though they are really good at what they are made to do I bought an extra pair for my purse just so I'd never be caught out and about suffering the pain of an unplanned walk. Weird or genius? Don't Care! I love them!

United States United States

Nice and light weight

I like having an option that isn't shapewear. Thank you

Emily G.
United States United States

Navy color runs small

I normally only buy beige and black shortlettes but decided to branch out and get navy, since I wear a lot of navy dresses. I wear a 3X in beige so I purchased the same size in the navy, and they are definitely smaller. There is a card included with each pair that says different colors may fit differently due to the dyed garment fabric, however I wish there was a disclaimer on each website page with the colors that might run small to order up a size for that particular pair.

United States United States

More Colors, Less Lace for 9 Inch Length

Loves these, like crazy! I have five pairs, I want more and I wont be getting any soon. Here's why, I will not buy any additional until the longer lengths are availible in all the fun and beautiful colors and are made without lace. The fit is fantastic, the truth in advertising is spot on. I love how they fit and feel. I am ready for the fun colors that will pop with my dresses and skirts. The lace is not durable, offer these without it, you will sell more!

Angelina B.
United States United States

Love My Undersummers

I have nothing but good things to say about my Undersummers and my purchase experience… They are pretty, soft silky, comfortable and feel good all day… With no riding, no, poking and they keep me cool! Thank you for providing this product. Customer service is always a Great! And they shipped very fast. I am hooked! Thank you

United States United States

Cute and Comfy!

They are a must have for me! Undersummers makes wearing dresses a comfortable possibility!

Michele B.
United States United States


I ordered 2 different colors. In place of the light blue I ordered I received a navy color. That was disappointing to me

United States United States


I recently bought the 9” fusion shortlette to prevent the chaffing that occurs between underwear and pant seam starts- this shortlette perfectly fits and prevents the chaffing

Debra J.
United States United States

Fusion Shortlette Anti-Chafing Slipshort

I just love my slipshort. I wore mine for the first time and was so pleased. I can wear dresses and skirts again. They don't ride up like other brands. I am definitely going to buy more colors.

United States United States

Thigh Savers

I haven’t been able to wear out and about yet thanks to quarantine, but they’re really comfortable and just the right length to save my thighs from chafing.

United States United States

Cool and comfy

I love my Undersummers! They fit great, keep me cool and comfortable, and stay where they are supposed to!

Ellen M.
United States United States

Classic comfort and good coverage

After buying a pair of these in black, I realized that what was missing from my life was a pair in navy...and I was very pleased to have that option. Now I am covered!

Kerri S.

Fantastic undies, they allow me

Fantastic undies, they allow me to finally wear dresses and skirts :)

Kim K.

I have been looking for

I have been looking for something like this for quite a long time, since my usual ones were discontinued. These are simply lovely and I will be getting more for sure!

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 and we will respond within 1 business day. 

updated 6/22/20