Size Chart - USA

Size Chart

For more detailed sizing and measuring help, visit click here.

Size

US Dress Size

Waist
(inches)

Hips
(inches)

XS

0

24-26

33-36

S

2-4

26-29

37-39

M

6-8

30-32

39-41

L

10-12

32-35

42-45

XL

12-14

36-39

46-48

XXL

14-16

39-43

48-51

XXXL

18-20

43-57

51-55

Check out our bestsellers

All flows (even heavy)
Classic Period Brief - Fri Period
Person wearing black high-waisted underwear with text highlighting features on a light gray background
Classic Period Brief
$29.00
Moderate-heavy flow
Period Boxers - Fri Period
Period Boxers - Fri Period
Period Boxers
$34.00
Light-moderate flow
Period Hipsters - Fri Period
Period Hipsters - Fri Period
Period Hipsters
$27.00

Read our blog

How Customer Feedback Shaped Our New Period Boxer Briefs - Fri Period
How Customer Feedback Shaped Our New Period Boxer Briefs
Introducing the New Fri Period Boxer Briefs: Now With an Improved Waistband - Fri Period
Introducing the New Fri Period Boxer Briefs: Now With an Improved Waistband
Period Underwear for Heavy Flow: How to Choose the Right Pair - Fri Period
Period Underwear for Heavy Flow: How to Choose the Right Pair