What materials are your products made from?

Our products are crafted from premium, moisture-wicking fabrics designed for maximum performance and comfort during your workouts.

How do I choose the right size?

Please refer to our detailed size guide available on each product page. We recommend measuring yourself and comparing to our size chart for the best fit.

What is your return policy?

We offer a 30-day return policy on all unworn items with tags attached. Please visit our returns page for full details.

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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.

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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.

Size Guide

UK Size	EU Size	US Size	Chest (cm)	Chest (in)	Waist (cm)	Waist (in)	Hip (cm)	Hip (in)
6	34	2	79-83	31-32.5	61-65	24-25.5	86-90	34-35.5
8	36	4	84-88	33-34.5	66-70	26-27.5	91-95	36-37.5
10	38	6	89-93	35-36.5	71-75	28-29.5	96-100	38-39.5
12	40	8	94-98	37-38.5	76-80	30-31.5	101-105	40-41.5
14	42	10	99-104	39-41	81-86	32-34	106-111	42-43.5
16	44	12	105-110	41.5-43.5	87-92	34.5-36	112-117	44-46

UK Size	EU Size	US Size	Waist (cm)	Waist (in)	Hip (cm)	Hip (in)
6	34	2	61-65	24-25.5	86-90	34-35.5
8	36	4	66-70	26-27.5	91-95	36-37.5
10	38	6	71-75	28-29.5	96-100	38-39.5
12	40	8	76-80	30-31.5	101-105	40-41.5
14	42	10	81-86	32-34	106-111	42-43.5
16	44	12	87-92	34.5-36	112-117	44-46

UK Size	EU Size	US Size	Chest (cm)	Chest (in)	Waist (cm)	Waist (in)	Hip (cm)	Hip (in)
6	34	2	79-83	31-32.5	61-65	24-25.5	86-90	34-35.5
8	36	4	84-88	33-34.5	66-70	26-27.5	91-95	36-37.5
10	38	6	89-93	35-36.5	71-75	28-29.5	96-100	38-39.5
12	40	8	94-98	37-38.5	76-80	30-31.5	101-105	40-41.5
14	42	10	99-104	39-41	81-86	32-34	106-111	42-43.5
16	44	12	105-110	41.5-43.5	87-92	34.5-36	112-117	44-46

Size	Chest (inches)	Underbust (inches)
XS	33⅛	27½
S	34⅝	29⅛
M	36¼	30¾
L	39⅜	33½
XL	42½	36¼
2XL	45⅝	39
3XL	48⅞	41¾

UK Size	EU Size	US Size	Chest (cm)	Chest (in)	Waist (cm)	Waist (in)
XS	44	34	86-91	34-36	71-76	28-30
S	46	36	91-97	36-38	76-81	30-32
M	48	38	97-102	38-40	81-86	32-34
L	50	40	102-107	40-42	86-91	34-36
XL	52	42	107-112	42-44	91-97	36-38
2XL	54	44	112-117	44-46	97-102	38-40

UK Size	EU Size	US Size	Waist (cm)	Waist (in)	Hip (cm)	Hip (in)
XS	44	34	71-76	28-30	86-91	34-36
S	46	36	76-81	30-32	91-97	36-38
M	48	38	81-86	32-34	97-102	38-40
L	50	40	86-91	34-36	102-107	40-42
XL	52	42	91-97	36-38	107-112	42-44
2XL	54	44	97-102	38-40	112-117	44-46

EU Size	UK Size	US Size
35	2.5	5
36	3.5	6
37	4	6.5
38	5	7.5
39	6	8.5
40	6.5	9
41	7.5	10

EU Size	UK Size	US Size
35	2.5	5
36	3.5	6
37	4	6.5
38	5	7.5
39	6	8.5
40	6.5	9
41	7.5	10

How to measure: For the most accurate fit, measure yourself in your underwear. Use a soft measuring tape and keep it snug but not tight. For chest measurements, measure around the fullest part of your bust. For waist, measure around the narrowest part. For hips, measure around the fullest part. For sports bras, measure your underbust directly under your bust where the band sits.

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

Our products are crafted from premium, moisture-wicking fabrics designed for maximum performance and comfort during your workouts.
Please refer to our detailed size guide available on each product page. We recommend measuring yourself and comparing to our size chart for the best fit.
We offer a 30-day return policy on all unworn items with tags attached. Please visit our returns page for full details.

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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.