Leakproof Underwear & Thigh Savers
| US Size |
Waist (in) |
Hip (in) |
| XS |
24–26 |
34–36 |
| S |
27–29 |
37–39 |
| M |
30–32 |
40–42 |
| L |
33–35 |
43–45 |
| XL |
36–39 |
46–49 |
| 2XL |
40–43 |
50–53 |
| 3XL |
44–47 |
54–57 |
Bras & Active Intimates
| Band Size |
Underbust (in) |
Bust (in) B-Cup |
Bust (in) D-F Cup |
| 32 |
28–30 |
33–34 |
35–37 |
| 34 |
30–32 |
35–36 |
37–39 |
| 36 |
32–34 |
37–38 |
39–41 |
| 38 |
34–36 |
39–40 |
41–43 |
| 40 |
36–38 |
41–42 |
43–45 |
| 42 |
38–40 |
43–44 |
45–47 |
| 44 |
40–42 |
45–46 |
47–49 |
Swimwear
| US Size |
Bust (in) |
Waist (in) |
Hip (in) |
| XS |
31–32 |
24–26 |
34–36 |
| S |
33–34 |
27–29 |
37–39 |
| M |
35–36 |
30–32 |
40–42 |
| L |
37–39 |
33–35 |
43–45 |
| XL |
40–42 |
36–39 |
46–49 |
| 2XL |
43–45 |
40–43 |
50–53 |
Sleepwear & Lounge
| US Size |
Bust (in) |
Waist (in) |
Hip (in) |
| XS |
30–32 |
24–26 |
34–36 |
| S |
33–35 |
27–29 |
37–39 |
| M |
36–38 |
30–32 |
40–42 |
| L |
39–41 |
33–35 |
43–45 |
| XL |
42–44 |
36–39 |
46–49 |
| 2XL |
45–48 |
40–43 |
50–53 |
Teens (KnixTeen)
| Size |
Age Range |
Waist (in) |
Hip (in) |
| XS/S |
10–12 |
23–25 |
32–34 |
| M |
12–14 |
25–27 |
34–37 |
| L/XL |
14–16+ |
27–30 |
37–40 |
Men's Underwear & Apparel
| US Size |
Waist (in) |
Hip (in) |
Chest (in) |
| S |
28–30 |
34–36 |
36–38 |
| M |
31–33 |
37–39 |
39–41 |
| L |
34–36 |
40–42 |
42–44 |
| XL |
37–39 |
43–45 |
45–48 |
| 2XL |
40–42 |
46–48 |
49–52 |
* All measurements are in inches. Measure directly against skin for best accuracy.
* For leakproof underwear: If between sizes, size up for period days or overnight use.
* For bras: Band should feel snug on the loosest hook when new. Cups should fully contain tissue without gaping or spillage.
* Actual fit may vary by style, fabric stretch, and personal preference.
