---
product_id: 725231118
title: "5.0/MG SportFlex – Waterproof, Sweatproof, Silicone Accessory for Health, Fitness, & Wellness Wearable – Not Compatible with Gen 4"
price: "¥21074"
currency: JPY
in_stock: true
reviews_count: 11
url: https://www.desertcart.jp/products/725231118-5-0-mg-sportflex-waterproof-sweatproof-silicone-accessory-for-health
store_origin: JP
region: Japan
---

# 100% Waterproof for all conditions Breathable, adjustable fit with ventilation Durable, sweatproof & dirtproof silicone 5.0/MG SportFlex – Waterproof, Sweatproof, Silicone Accessory for Health, Fitness, & Wellness Wearable – Not Compatible with Gen 4

**Price:** ¥21074
**Availability:** ✅ In Stock

## Summary

> 💪 Elevate your fitness style with the band that works as hard as you do.

## Quick Answers

- **What is this?** 5.0/MG SportFlex – Waterproof, Sweatproof, Silicone Accessory for Health, Fitness, & Wellness Wearable – Not Compatible with Gen 4
- **How much does it cost?** ¥21074 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/725231118-5-0-mg-sportflex-waterproof-sweatproof-silicone-accessory-for-health)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Soft-Touch Comfort:** Ultra-smooth silicone that feels like a second skin and stays hygienic with easy cleaning.
- • **Seamless Band Swapping:** Fast Link slider lets you switch styles effortlessly to match your vibe or workout.
- • **Exclusive Compatibility:** Designed specifically for WHOOP One and Peak—upgrade your wellness game with the perfect fit.
- • **Unstoppable Performance:** Built to endure your toughest workouts and water adventures without missing a beat.
- • **Tailored Fit, Maximum Breathability:** Adjustable closure with ventilation keeps you comfortable and secure no matter the intensity.

## Overview

The WHOOP 5.0/MG SportFlex is a premium silicone accessory engineered for high-performance fitness and wellness wearables. Fully waterproof, sweatproof, and dirtproof, it offers a breathable, adjustable fit with ventilation for all-day comfort. Compatible exclusively with WHOOP One and Peak models, this durable band features a Fast Link slider for quick swaps, making it the ultimate upgrade for active professionals who demand style and resilience.

## Description

Made with soft-touch silicone, SportFlex is waterproof, sweatproof, and dirtproof—built to take on high performance and water activities. Includes a Band, Hook, Clasp, and a Fast Link slider that makes swapping bands easier than ever. Compatible with WHOOP One and WHOOP Peak—membership not included. This is not compatible with the WHOOP 4.0.

Review: Great product - The product is original whoop product and hence quality is visible. Hope that the color and the softness of the material remain unchanged throughout the journey and show value to the amount I paid for. It’s better to buy here such accessories to avoid delivery charge to whoop. The delivery was completely messed up by desertcart and it took 2 days for me to receive the item.
Review: Love it - I love the silicon band. It solves my complaint with the stretching I was getting with the superknit whenever I sweat in them. This colorway looks fantastic, too.

## Features

- BUILT FOR HIGH PERFORMANCE – SportFlex is designed with waterproof, sweatproof, and dirtproof silicone. It’s highly durable and designed to withstand your most intense workouts and adventures.
- MADE WITH SOFT-TOUCH SILICONE – SportFlex is ultra-smooth, hygienic, and easy to clean. Small scuffs can be wiped off, or you can deep-clean the band with isopropyl alcohol and a lint-free cloth followed by a water rinse.
- ADJUSTABLE AND BREATHABLE – SportFlex is made with an adjustable closure system to ensure a snug, secure fit—no matter how intense your workout. The band includes ventilation details, making it extra breathable and comfortable.
- 100% WATERPROOF – SportFlex is completely waterproof, making it an essential accessory for everything from swimming laps and surfing to high-sweat, high-intensity workouts.
- COMPATIBILITY – This is not compatible with the WHOOP 4.0

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Care instructions | Clean with isopropyl alcohol and water. Rinse after use. |

## Images

![5.0/MG SportFlex – Waterproof, Sweatproof, Silicone Accessory for Health, Fitness, & Wellness Wearable – Not Compatible with Gen 4 - Image 1](https://m.media-amazon.com/images/I/51LkuBAxIEL.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great product
*by M***N on 13 November 2025*

The product is original whoop product and hence quality is visible. Hope that the color and the softness of the material remain unchanged throughout the journey and show value to the amount I paid for. It’s better to buy here such accessories to avoid delivery charge to whoop. The delivery was completely messed up by Amazon and it took 2 days for me to receive the item.

### ⭐⭐⭐⭐⭐ Love it
*by A***S on 19 August 2025*

I love the silicon band. It solves my complaint with the stretching I was getting with the superknit whenever I sweat in them. This colorway looks fantastic, too.

### ⭐⭐⭐⭐⭐ SAME AS DESCRIBED
*by M***A on 8 July 2025*

Good Qualit

## Frequently Bought Together

- WHOOP 5.0/MG SportFlex – ECG Compatible, Waterproof, Sweatproof, Silicone Accessory for Health & Fitness Wearable - Not Compatible with Gen 4
- WHOOP 5.0/MG SuperKnit – ECG Compatible, Signature Performance Knit – Not Compatible with Gen 4

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**Shop now:** [https://www.desertcart.jp/products/725231118-5-0-mg-sportflex-waterproof-sweatproof-silicone-accessory-for-health](https://www.desertcart.jp/products/725231118-5-0-mg-sportflex-waterproof-sweatproof-silicone-accessory-for-health)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-28*