Premium SMS Bio Sport Earbud w/ Heart Monitor - Black/Grey. Studio-mastered sound, strap-free heart rate tracking, sweat-proof. Compatible with fitness apps.

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GymBum UK Size Guide

GYMBUM UK®

Size Guide

1️⃣ Women – Sports Bras

Measure Yourself

For accurate sizing, keep the tape measure level and parallel to the ground.

Bust
Measure around the fullest part of your chest.

Underbust
Measure directly under your bust where the bra band sits.

Body Measurements (Inches)

Size	Bust	Underbust
XS	33–34"	27–28"
S	34–36"	28–30"
M	36–38"	30–32"
L	38–40"	32–34"
XL	40–43"	34–36"
2XL	43–46"	36–39"
3XL	46–49"	39–42"

Between sizes?
Size up for a more comfortable fit.
Size down for a more compressive performance fit.

2️⃣ Women – Tops & T-Shirts

Body Measurements (Inches)

UK Size	Bust	Waist
4–6	31–33"	24–26"
8–10	33–36"	26–28"
12–14	36–40"	28–32"
16	40–43"	32–34"
18	43–46"	34–37"

3️⃣ Women – Leggings & Shorts

Body Measurements (Inches)

UK Size	Waist	Hips
4–6	24–26"	34–36"
8–10	26–28"	36–38"
12–14	28–32"	38–42"
16	32–34"	42–44"
18	34–37"	44–46"

4️⃣ Men – Tops & Hoodies

Size	Chest	Waist
S	36–38"	30"
M	38–40"	32–34"
L	42–44"	36"
XL	46–48"	38"
XXL	50–52"	40–42"

5️⃣ Men – Shorts & Joggers

Size	Waist
S	30"
M	32–34"
L	36"
XL	38"
XXL	40–42"

Fit & Sizing Notes

Some styles follow Asian sizing and may run 1–2 sizes smaller than standard UK sizing.
Refer to each product description for specific fit details.
Measurements may vary slightly depending on fabric and cut.

SMS Audio Bio Sport Earbud with Heart Monitor - Black/Grey" Description: "Experience superior sound quality on the go with the SMS Audio Bio Sport Earbud. These earbuds are professionally tuned with 12mm drivers to deliver crisp vocals, tight bass, and dynamic mid-tones, giving you the studio-mastered sound wherever you are. Track your heart rate in real-time without the hassle of uncomfortable straps or multiple devices. The built-in heart rate monitor allows you to monitor your heart rate while listening to your favorite tracks. Whether you're hitting the gym or going for a run, these earbuds are built to withstand sweat and water with its IPX4-rating. So you can dive into your workouts without worrying about damaging your earbuds. Forget about replacing or recharging batteries, the 3.5 mm gold-plated audio jack provides all the power you need for biometric monitoring. Stay on track and in shape with compatibility with major fitness apps like Run Keeper. With the SMS Audio Bio Sport Earbuds, you can track your results and achieve your fitness goals with ease. - Professionally tuned 12mm drivers for superior sound quality - Built-in heart rate monitor for real-time tracking - IPX4-rated for resistance to sweat and water - No need for batteries, powered by the 3.5mm audio jack - Compatible with major fitness apps like Run Keeper

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Premium SMS Bio Sport Earbud w/ Heart Monitor - Black/Grey. Studio-mastered sound, strap-free heart rate tracking, sweat-proof. Compatible with fitness apps.