Instinct

Up and Under in Cardiff stocks Instinct running hydration vests and accessories, designed to provide comfort and performance on the toughest trails. Born in the French Alps and tested worldwide, Instinct gear focuses on functionality, ergonomics and freedom of movement. Each product has been developed with input from athletes and runners, ensuring a second-skin fit and durability for any adventure.
Instinct embodies a deep connection with nature, promoting seamless movement and enhanced comfort on the trail. Committed to sustainability, the brand prioritizes environmentally friendly production methods while crafting innovative gear.
Instinct Leg Sleeves
The Instinct Leg Sleeves are lightweight, packable running leg warmers that turn shorts into tights in seconds. Their seamless design offers second-skin comfort, while quick-drying, temperature-regulating fabric helps manage moisture and odour. Ideal for trail running, ultra races and long-distance adventures where versatility and low weight matter.
Instinct Arm Sleeves
The Instinct Arm Sleeves offer lightweight, seamless comfort for running and endurance sports. Made with high-performance fibres and castor bean-derived bio-based filaments, they provide temperature regulation, quick-drying performance and odour control.
Instinct Spork 3 - in - 1
The Instinct Spork 3-in-1 is a lightweight utensil designed for hiking, trail running, travel and outdoor adventures. Combining a spoon, fork and knife in one compact design, it saves space in your backpack while providing everything you need for meals on the go. Made from BPA-free and phthalate-free polypropylene, this reusable spork is a practical alternative to disposable cutlery. Weighing just 7g, it is an ideal addition to any lightweight camping or outdoor kit.
Instinct Soft Cup Beer
The Instinct Soft Cup Beer is a reusable 220ml soft drinking cup designed for trail running, hiking, camping and endurance races. Its lightweight 8g design makes it easy to carry in a running vest or backpack without taking up much space. Made from flexible TPU, this collapsible-style cup is suitable for cold and warm drinks up to 60°C. BPA-free, PVC-free and phthalate-free, it offers a practical alternative to disposable race cups and outdoor drinking containers.
Instinct Collapsible Bowl 400
The Instinct Collapsible Bowl 400 is a compact and reusable bowl designed for long races, backpacking and outdoor adventures. Its 400ml capacity is ideal for meals and drinks on the trail, while the foldable design packs down to just 13mm thick to save space in your bag. Made from silicone and ABS, it is BPA-free, phthalate-free and suitable for temperatures from -10°C to 100°C. This lightweight, top-rack dishwasher-safe bowl is a practical choice for outdoor enthusiasts looking for convenient and reusable kit.
Instinct Ergo Quiver II
The Instinct Ergo Quiver II is a lightweight running pole holder designed for trail running, ultra-distance races and mountain adventures. Its double quiver system keeps poles securely separated and helps distribute weight evenly for improved balance and comfort. Quick-access storage makes it easier to take poles out and put them away while on the move, without unnecessary stops. Made from durable nylon Spectra ripstop fabric with padded EVA backing, it weighs just 72g and helps reduce pole bouncing and noise during demanding runs.
Instinct Ergo Quiver I
The Instinct Ergo Quiver I is a lightweight 40g running pole holder designed for trail running, mountain running and ultra-distance adventures. It carries one pair of poles securely, with a quick-access opening that makes storing and removing poles simple while on the move. Durable Spectra ripstop nylon, EVA back padding and a secure lower cord system make it a practical choice for demanding outdoor runs.
Instinct Gel Cell 150ml
The Instinct Gel Cell 150ml is a reusable energy gel flask for trail running, marathons, ultra running and long-distance cycling. This lightweight 25g soft flask holds around 5 to 6 energy gels, giving you quick access to your sports nutrition without carrying multiple sachets. Its compressible body and high-flow nozzle make on-the-go fuelling simple, while the secure cap helps prevent leaks. Dishwasher safe and made from BPA-, PVC- and phthalate-free materials, it is a convenient way to simplify race fuelling and reduce packaging waste.
Instinct Evolution 7L
The Instinct Evolution 7L Running Vest is a lightweight and breathable pack designed for trail running from 20km to ultra-distance races. Weighing just 210g, it offers practical storage for hydration, food, poles and essential gear without adding unnecessary bulk. Multiple easy-access pockets keep your essentials within reach, while adjustable chest straps and elastic side lacing provide a secure fit. Compatible with soft flasks, bottles and a 1.5L hydration bladder, it is ideal for runners looking for comfort, flexibility and performance on the trail.
Instinct X - 10L
The Instinct X 10L Running Vest is a lightweight, breathable pack designed for trail running, ultra-distance racing and long training sessions. Its 10L capacity provides plenty of space for hydration, food, clothing and essential gear. Multiple front and rear pockets allow quick access to everything you need without removing the vest. Adjustable chest straps and elastic side lacing provide a secure and comfortable fit, while flexible hydration and pole-carrying options make it a versatile choice for demanding trail runs.
Instinct Eklipse 12L
The Instinct Eklipse 12L is a lightweight trail running vest designed for ultra running, long-distance races and trail adventures. With 12 litres of storage and a weight of just 380g, it has plenty of space for water, food, clothing and essential kit. Easy-access pockets, breathable mesh and an adjustable fit help keep you comfortable throughout your run. With water-resistant storage and four pole carrying options, the Eklipse 12L is a great choice for trail running, ultra racing and trekking.
Instinct Endurance Cap
The Instinct Endurance Cap is a lightweight and breathable cap designed for running and high-intensity activity. Its micro-mesh fabric keeps you cool, while the foldable design makes it easy to pack. The flexible peak adds comfort, and the adjustable strap ensures a secure fit. Ultra-light at just 37g, it’s ideal for racing, training and travel. A practical and stylish choice for active use.
Instinct Trail Race Cup 200
The Instinct Race Cup is a soft, foldable, and reusable drinking cup, perfect for trail races, ultra runs, and outdoor adventures. A race-day essential, it replaces disposable cups to reduce plastic waste. Made from durable TPU, it’s BPA, PVC, and phthalate-free for safe hydration. The lightweight, collapsible design fits easily into a pocket or vest, while the carabiner-compatible handle offers easy access. Suitable for hot and cold drinks (up to 60°C/140°F), it’s the sustainable choice for endurance athletes.
Instinct Race Number Belt
Th3 Instinct Race Number Belt is a race-day essential, the Race Number Belt keeps your race number secure and visible, so you can focus on performing your best. Equipped with three spring-loaded toggles, it firmly holds your race number in place, even during intense movement. With reflective logos for added visibility and an adjustable, one-size-fits-all design, this belt combines practicality with comfort. The sturdy nylon buckle clip ensures a quick and reliable fit every time.
Instinct Hydracell 600
The Instinct Hydracell 600 is a compressible softflask bottle with a circular bottom, making it more resistant to abrasion and punctures. It will slide perfectly into the pockets of your Instinct pack for on-the-go hydration.
Instinct Alpi 40L
The Instinct Alpi 40L is the pinnacle of versatility for endurance alpine athletes. It offers legendary stability, function and ergonomics suitable for a range of activities from trail running and hiking, to ski touring and mountaineering. The Alpi 40L is a premium quality pack that sits high on the back and incorporates intuitive storage and technical solutions that allow immediate access to your most important items and essentials. Compressed down, it fits like a low-profile trail pack. Fully loaded, it allows for multi-day adventures.
Instinct XX 20-24L (with Flasks)
The Instinct XX 20-24L marks a new beginning for those seeking the ideal solution for multi-day trail races, ultra-distance events or self-sufficient adventures. It's evolutive in volume and offers intelligent, segmented storage that provides easy access to your essentials in the most critical conditions. Extreme function allows customization in how gear/clothing/food/hydration can be carried.
Instinct X8 - 18L
The Instinct X8 - 18L offers unrivalled function and versatility for ultra-distance racing, fast light hikes and multi season adventures. It features top & bottom horizontal mesh stretch pockets, a 2.5L water bladder pocket and has space to store a camping mat or tent underneath, as well as a variety of easy-access pockets to you can easily reach your essentials on-the-go.
Instinct Ambition 4.5L
The Instinct Ambition 4.5L is a minimalist, refined and performance orientated running hydration vest that will help you go further. This compact pack offers clever storage solutions, extreme functionality and a fit that's so natural you forget you're wearing it. It features adjustable sternum straps and Instinct's unique elastic side lacing system, allowing for a custom fit to almost any body type. Discover stability, liberty of movement, immediate access to storage and unconstrained breathing with the Instinct Ambition 4.5L.
Instinct PX 3.1L
The Instinct PX 3.1L is a minimalist, lightweight and non-compressive running pack for carrying your essentials, a great option for road & trail running or even your next marathon. It features adjustable front sternum straps and Instinct's unique elastic side lacing system, which allows for a custom fit to almost any body type. Discover stability, absolute freedom of movement, immediate access to storage and unconstrained breathing with the Instinct PX 3.1L.
Instinct Ergo Bottle Pocket
The Instinct Ergo Bottle Pocket allows for extra storage of water, food and smaller essentials, great for use on multi-day stage races and adventures. It features small callipers that allow for easy and secure attachment to various points on your pack. Quick release buckles make it possible to remove the pocket if needed.
Instinct Trail Running Reflex Belt
The Instinct Trail Running Reflex Belt provides you with hands-free storage for all your essentials without the need to wear an uncomfortable backpack or vest. The belt features six pockets with integrated race bib holders and reflective loops for arms-free enjoyment on the trails.