Men's Thong, Jockstrap & C-String Size Guide (Updated July 2026)
Last updated: July 2026
Quick answer: Most men's erotic underwear runs true to size, but because stretch fabrics vary, the safest rule is: measure your waist, check the product's size note, and size up if you are between sizes. One-size styles (C-strings, most G-strings) fit the majority of body types thanks to flexible frames and stretch fabric.
How to measure yourself
You only need two numbers. Measure your waist at the point where the underwear will actually sit — for low-rise thongs this is at the hips, roughly 5 cm (2 in) below your natural waistline. Then note your body weight, since many Asian-made styles size by weight range rather than waist measurement.
Size guide by style
Thongs and briefs (sized S–XXXL)
Classic sized styles like low-rise thongs and briefs follow standard sizing: S fits roughly a 28–30 in (71–76 cm) waist, M fits 30–33 in (76–84 cm), L fits 33–36 in (84–91 cm), XL fits 36–39 in (91–99 cm), and XXL fits 39–42 in (99–107 cm). Four-way stretch fabric is forgiving, but metallic and satin fabrics have less give than cotton blends — size up for shiny fabrics.
Strappy harness and cutout styles (sized M–L / XL–XXL)
Harness-style briefs are sold in two combined sizes rather than single letters, because the elastic straps adjust across a wider range. M–L fits roughly a 30–36 in (76–91 cm) waist and XL–XXL fits roughly 36–42 in (91–107 cm). Straps should sit flat against the skin without indenting it — if a strap digs in, size up. See our strappy harness cutout briefs for a typical example of this sizing.
Jockstraps
Jockstraps need a secure fit through the waistband and leg straps. They should feel snug but never dig in. If the product lists a recommended weight range per size, trust it over your usual size in briefs.
C-strings (strapless)
C-strings have no waistband — an internal flexible frame holds them in place. They are genuinely one-size-fits-most: the frame adapts to most body types. If you have tried one and found it insecure, a V-string or G-string with a proper waist strap is the more reliable choice.
One-size G-strings and V-strings
Most one-size stretch styles comfortably fit waists from about 36 to 44 inches (91–112 cm) or body weights up to roughly 95 kg (210 lb) — always check the specific product's size note.
Care instructions
All delicate men's underwear follows the same rule: hand wash cold, air dry. Never tumble dry, bleach, or iron. Heat permanently damages metallic finishes, satin blends, and elastic.
Frequently asked questions
Do men's thongs run small? Stretch cotton blends run true to size. Metallic and satin fabrics have less stretch — order one size up.
What if I'm between sizes? Size up. A slightly relaxed fit is comfortable; a too-small thong is not.
Is shipping discreet? Yes — every order from Femme Bliss ships in plain, unbranded packaging.
Can underwear be returned? Unworn items in original, unopened packaging can be returned per our refund policy. Worn underwear cannot be returned for hygiene reasons.
Browse the full range in our Men's Lingerie & Underwear collection — from athletic jockstraps to metallic thongs and strappy harness briefs.