Name: Black Relief Extender
Brand: EBY
SKU: OB00EXTBK0M
Availability: InStock

Panty

XS 00-2

S 2-4

M 6-8

L 10-12

XL 14-16

2X 18-20W

3X 22-24W

4X 26-28

Select panty size

1 box delivered every month
Skip or cancel anytime
15% off all items every time you shop
Your first box is $49

EBY Membership

Quarterly comfort delivery. Zero thinking required.

Every 3 months, we send you pieces you actually wear, priced like you're about to replace everything else.

What You Get

You choose what arrives in your quarterly drop:

Four Panties – Seamless, sheer, or a mix. Top drawer, upgraded every 3 months.
One Set – One bra. One panty. Wire-free support + seamless panty. Match them or don't. Your underwear, your rules.

What's in the Lineup

Sheer Bralette
Relief Bra
Support Bralette
Wireless Bralette
Sheer and Seamless Panties
- Thongs
- Briefs
- High Waisted Thongs & Briefs

How It Works

Pick your drop: 4-panty bundle or a bra + panty set
Choose your size(s)
Mix and match across styles and colors: Bold. Spicy. Sophisticated. Choose exactly what you want.
Get billed when it ships: Once every 3 months. No surprises.

Member Perks

Insider 25% Off: Just log-in and every time you shop at join-eby.com, a 25% off member discount goes with you.
40% Off Add-ons: Add anything else to your subscription order – get 40% off, every time.
Free Shipping for all quarterly orders: Plus, free shipping on orders $75+ for all other orders (compared to $120 for non-members).
Priority Access: First in line for new drops, prints, styles, sales, and restocks. Before everyone else.
100% Fit Guarantee: We design for all shapes and sizes – not size small scaled up. If it doesn't fit, we'll help you find something that does.
Patented Comfort Technology: Built into every product. Not a claim. A patent.
Meaningful Impact: Every purchase funds business loans for women transitioning out of poverty. Members have helped change more than 20,000 lives.

Frequency

We send you 4 new panties every 3 months

Member Savings

15% off every item, every time you shop
Free shipping, every order, every time you shop

Options

Opt for us to surprise you with new panties each renewal, based on your preferences
Or, choose the exact panties you want to receive

Flexibility

Change your preferences at any time
Skip or cancel at any time
Change your members box at any time

How it works

Set your preferences

Styles
Size
Color

Styles

Choose Your Own to get exactly what you want, and you'll make selections before each renewal.
Or, choose Surprise Me and we'll send you new panties each renewal based on your preferences.

Size

Choose the size you normally wear
Size guides are provided for reference

Color

Set your color profile, and we'll send you our spicy, bold, or sophisticated colors & prints.
Or, select the exact color and style you want when you opt for Choose Your Own.

Payment

You are billed once every 3 months
We bill when your members box ships.
The box type you choose determines price

Everything you get with the 4 panties box

15% off every item, every time you shop
Free shipping, every order, every time you shop
Priority access to new releases
100% fit guarantee
EBY's exclusive comfort technology
Relief from daily discomfort
Meaningful impact in the lives of women

Size Guide

Size Chart

How To Measure

Follow these steps for your perfect fit

1. Get a measuring tape

You can do this on your own or get a friend to help. Wear a non-padded, wired bra for best results. Always relax and make sure your arms are by your side.

2. Find your band size

Align the tape around your body at ribcage level, directly under the bust, keeping the tape parallel to the floor. Tape should feel snug but not tight around the body. Record your measurement.

Find your band size according to the measure chart.

Measurement/Band Size

27-28"	29-30"	31-32"	33-35"	36-38"	39-41"	42-44"
32	34	36	38	40	42	44

Measurement	Band Size
27-28"	32
29-30"	34
31-32"	36
33-35"	38
36-38"	40
39-41"	42
42-44"	44

3. Find your cup size

Wrap the measuring tape around your body at the fullest part of your bust, ensuring the tape is parallel to the floor. The tape should fit comfortably around your body. Take note of this measurement.

Then, subtract your band size from your bust size to determine your cup size.

* For instance, if your bust measures 36 inches and your band size is 32 inches, the difference is 4 inches, indicating a cup size of D.

Bust-Band Difference/Cup Size

1”	2”	3”	4”	5”	6”	7”
A	B	C	D	DD	DDD	G

Bust-Band Difference	Cup Size
1"	A
2"	B
3"	C
4"	D
5"	E
6"	F
7"	G

Cup / Band	32	34	36	38	40	42	44
A	XS	S	M	L
B	XS	S	M	L	XL
C	XS	S	M	L	XL	XLDD
D	S	M	L	XL	XL	XLDD	2XLDD
DD	SDD	SDD	MDD	LDD	XLDD	XLDD	2XLDD
DDD	SDD	SDD	MDD	LDD	XLDD	2XLDD	2XLDD
G	SDD	MDD	LDD	LDD	XLDD	2XLDD

100% Fit Guarantee

If your order doesn't fit perfectly, please contact our team of fit experts within 30 days of the date of delivery at seamlesssupport@join-eby.com

Panty Size

Size	Full Hip (in)	Waist (in)	Pants
XS	33-35	23-25	00-2
S	36-38	25-28	2-4
M	39-41	28-30	6-8
L	42-44	31-34	10-12
XL	44-47	34-36	14-16
1X	48-50	37-39	16-18
2X	51-53	39-41	18-20
3X	54-56	41-43	22-24
4X	57-60	43-45	26-28

Tank Size

Size	Dress Size
XS	00-2
S	2-4
M	6-8
L	10-12
XL	14-16
1X	16-18
2X	18-20

Choose your VIP Subscription

Bra + Panty Set

Bra + Panty Set

Panty 4-Pack

Panty 4-Pack

Black Relief Extender

EBY Size Guide

Bra Size Chart