This discontinued GYM product runs very small in size compared to the 2.0 products.  Size up at least one size. 

GYM Swim/Run Jockstrap:
GYM 1" Swim/Run jockstrap designed for swimming and moderate exercise made by GYM Jockstrap, Jockstraps.com own brand.  These jockstraps feature a narrow waistband and are great for swimming activities.  Available in White, Black, Grey, Red, Yellow or Royal Blue.

Features:
Ideal support for active wear
Slim logo waistband, not visible under swimmers
Breathable fabric construction

Colors: White, Black and Royal

Material: 55% Nylon, 25% Rubber, 20% Cotton
Garment Care
Tumble dry low
Do not dry clean
Do not bleach
Do not iron

Size Chart

 

Size	Inches	Centimeters
Small	28-30	71-76
Medium	32-34	81-86
Large	36-38	91-96
X-Large	40-42	101-107
XX-Large	44-46	112-117
3XL	48-50	122-127