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Triple Magnesium Taster Pack
Triple Magnesium Taster Pack
Improve your sleep in 5 days!
€6,63
Rawvelo Taster Pack
Rawvelo Taster Pack
Try 1 Hydration Drink & 1 Energy Gel
€2,65
Naak Caffeine Bar Pack
Naak Caffeine Bar Pack
Short date; 45g of carbs
€3,98
Getbuzzing Taster Pack
Getbuzzing Taster Pack
Short date; 30g carbs per bar!
€2,65
Hammer Gel Taster Pack
Hammer Gel Taster Pack
Short Date; 3 Gels for £4
€5,30
fourfive Vitamin C
fourfive Vitamin C
Short date; half-price wellness
€6,63
PILLAR Ultra Immune C Pack
PILLAR Ultra Immune C Pack
High impact immunity formulation
€3,98
Zooki Magnesium Taster Pack
Zooki Magnesium Taster Pack
200mg magnesium per sachet
€2,65
Active Root Taster Pack
Active Root Taster Pack
Try 1 Sports Drink, 1 Electrolite & 1 Energy Gel
€3,98
Sticker Pack
Sticker Pack
Get 3 stickers for £1
€1,33

Reflex Belt

Visit the Instinct store
€52,94

Introducing the PX 3.1L Trail Running Belt by Instinct, the ultimate solution for runners who demand both functionality and comfort. This innovative belt is designed to simplify your running adventures, eliminating the need for cumbersome backpacks or vests. With a total of six intelligently designed pockets, it offers ample storage space for all your essential items, ensuring you can carry everything you need without hassle.

Product Features

  • Six optimally designed pockets for customised storage
  • Secure front pocket for smaller items like keys and energy gels
  • Two extra-large pockets for a jacket or 600ml soft flasks
  • Tubular pocket with silicone bands for secure pole storage
  • Integrated race bib holder for added convenience
Select Size
Select Type: Reflex
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Size Guide:



Product Description

One of the standout features of the PX 3.1L is its secure front pocket, perfect for storing smaller items such as keys, credit cards, or energy gels. Additionally, the belt includes two extra-large pockets, which are ideal for stashing a lightweight jacket or a pair of 600ml soft flasks. This thoughtful design means you can stay hydrated and prepared for any weather conditions without feeling weighed down.

The PX 3.1L also boasts a tubular pocket equipped with silicone bands, providing a secure spot for your poles. Whether you're tackling steep ascents or rugged trails, this feature ensures your poles are always within easy reach. Integrated race bib holders add another layer of convenience, allowing you to attach your bib securely without fuss.

Safety and visibility are paramount, and the PX 3.1L excels in these areas with its reflective loops. These loops make it easy to open pockets even in low-light conditions, and they enhance your visibility to others on the trail. The belt is crafted from stretchable, breathable mesh, ensuring optimal ergonomics and superior sweat dissipation, keeping you comfortable throughout your run.

For the perfect fit, measure 2 cm below your belly button. It's worth noting that these belts tend to run a bit small, so we recommend opting for the larger size. With the PX 3.1L Trail Running Belt, you can enjoy a hands-free adventure, keeping all your essentials secure and accessible, allowing you to focus on the trail ahead.

  • Six optimally designed pockets for customised storage
  • Secure front pocket for smaller items like keys and energy gels
  • Two extra-large pockets for a jacket or 600ml soft flasks
  • Tubular pocket with silicone bands for secure pole storage
  • Integrated race bib holder for added convenience
  • Reflective loops for easy pocket access and enhanced visibility
  • Stretchable, breathable mesh for improved ergonomics and sweat dissipation
  • Recommendation to opt for a larger size for a better fit
Delivery / Returns FREE UK Delivery orders over £30,00, Next Day Service + FREE UK Returns

Shipping Information - Details

UK Standard Delivery - This means that your goods will be processed as normal and shipped by Royal Mail 48. Ordered goods will usually arrive within 3 - 5 working days for most of the UK mainland. Baskets with a total value (before vouchers and promotional codes are applied) of £30.00 and over will qualify for FREE UK delivery.

UK FREE Delivery - to all of the UK on almost every product, as long as your total basket value is greater than £30.00 (delivery charges are applied to baskets with a total value of less than £30.00). - All FREE Delivery order will be sent via (UK) STANDARD SHIPPING (Royal Mail 48)

Need it Quicker? - Select DPD Next Working Day or Fast Delivery at checkout - Orders will be processed as normal and shipped by either DPD for Next Working Day service (excluding weekends) or the Royal Mail Tracked 24 service, ordered goods will usually arrive within (1 - 2 working days)

RETURNS & REFUNDS - Details

Return this item for free - If you change your mind on your purchase, you have a 30 days to return it for a refund or replacement subject to terms. All goods must be in new and unused condition and in their original packaging with all labels still attached

About Instinct

Born on the trails of the French Alps and race approved around the world.

Redefining a hydration pack comes from asking the right questions... introducing analytical observations & first hand experience in running the toughest conditions. At the heart of each revolutionary Instinct product is the desire to achieve a greater degree of function, accessibility and ergonomics; Total liberty of movement, zero obstruction and a second skin fit.