Running
Up and Under Trail Running
Welcome to the Trail and Ultra Running section of our website. Up and Under in Cardiff has been supplying fell running specific footwear for years, but has expanded into the wide ranging and glorious world of trail running in the past 10 years. We have a close working relationship with a number of trail and ultra race organizers in the area, most notably Run Walk Crawl, Ridge Runners and Up Hill Down Dale and have therefore expanded our range to cover Ultra Running products that can help you race on all terrains, through day and night, for 4 seasons of the year.
A lot of our core clothing ranges and equipment such as headtorches, first aid kits, whistles, etc. are equally appropriate for trail-running so don't forget to take a look around those sections or use our search if what you need isn't immediately obvious within this part of our catalogue.
We select the best trailshoes, packs, poles, vests, torches and clothing from baselayer through socks, shorts, tights and insulation to windproof and waterproof shell, hats and gloves and we have what you need for all your fell and trail-running needs, all carefully selected by our staff with insights from Run, Walk Crawl to suit you. It's all from the best brands, but see the quick links below to rapidly access some of our most popular. It's also worth having a browse outside of running through our Odlo range for extra warm quick drying, high wicking, lightweight base and midlayer clothing and everything beyond.
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Instinct
Race Cup
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.
Mac In A Sac
Ultralite Trouser
The Mac in a Sac Ultralite Trousers are the ultimate choice for trail runners and outdoor enthusiasts seeking lightweight, waterproof performance without compromise. Made from ultra-light, flexible Vaporlite fabric (90% Polyester, 10% Spandex), these trousers provide exceptional freedom of movement and adapt effortlessly to changing conditions. With a waterproof rating of 8,000 mm, breathability of 16,000 gsm, and windproof construction, they keep you dry and comfortable on any trail. Fully taped seams, articulated knees, and reflective detailing add to their durability and functionality, making them perfect for fast-paced adventures.
Darn Tough
Women's Element No Show Tab Lightweight Running Sock
The Darn Tough Women's Element No Show Tab Lightweight Running Socks combine lightweight Merino wool, breathable mesh, and cushioned comfort to deliver blister-free and high-performance runs. Enjoy a snug, performance fit engineered to prevent slipping or bunching during any workout. Crafted in the USA with premium materials, these socks offer superior moisture-wicking and temperature regulation for unmatched durability and responsiveness. Experience advanced comfort with a lifetime guarantee that makes each stride a testament to quality and innovation.
Mac In A Sac
Ultralite Jacket Ladies
The Mac in a Sac Ultralite Jacket for Women is the ultimate running companion for unpredictable weather, offering a lightweight, packable, and stretchable design that easily fits into its own pocket. With a highly waterproof (8,000 mm) and breathable (16,000 mm) 2.5-layer construction, fully taped seams, and windproof fabric, it keeps you dry and comfortable in any conditions. The adjustable hood with a wire peak, reflective detailing for visibility, and secure zipped pockets add practicality, while the PFC & PFOA-free materials make it an eco-friendly choice for active adventurers.
Mac In A Sac
Ultralite Trouser Ladies
The Mac in a Sac Ultralite Trousers (ladies) are the ultimate choice for trail runners and outdoor enthusiasts seeking lightweight, waterproof performance without compromise. Made from ultra-light, flexible Vaporlite fabric (90% Polyester, 10% Spandex), these trousers provide exceptional freedom of movement and adapt effortlessly to changing conditions. With a waterproof rating of 8,000 mm, breathability of 16,000 gsm, and windproof construction, they keep you dry and comfortable on any trail. Fully taped seams, articulated knees, and reflective detailing add to their durability and functionality, making them perfect for fast-paced adventures.
Mac In A Sac
Ultralite Jacket
The Mac in a Sac Ultralite Jacket is the ultimate running companion for unpredictable weather, offering a lightweight, packable, and stretchable design that easily fits into its own pocket. With a highly waterproof (8,000 mm) and breathable (16,000 mm) 2.5-layer construction, fully taped seams, and windproof fabric, it keeps you dry and comfortable in any conditions. The adjustable hood with a wire peak, reflective detailing for visibility, and secure zipped pockets add practicality, while the PFC & PFOA-free materials make it an eco-friendly choice for active adventurers.
OMM Ltd
Kamleika Smock
The OMM Ltd Kamleika Smock is a lightweight, waterproof, and breathable running shell designed for mountain athletes tackling tough conditions. Its 4-way stretch fabric moves with you like a softshell while delivering full waterproof protection, now with a PFAS-free membrane and PFC-free DWR for a lower environmental impact. Built for performance and comfort, it features an adjustable wired hood, extended cuffs with thumb slots, a dynamic droptail, a YKK AquaGuard half-zip, and a watch window. Now in its 6th generation, the Kamleika Smock offers exceptional mobility, durability, and weather protection - a trusted choice for serious trail runners.
Rab
Nitron 25
The Rab Nitron 25 is a lightweight and stable 25L pack, perfect for fast-paced hikes and mountain adventures. Designed for comfort and freedom of movement, it features a vest-style harness and flexible back system that hugs the body for a secure fit. With a sleek design and easy-access pockets, it keeps your essentials within reach, so you can stay focused on the trail ahead.
OMM Ltd
Rosa Vest (Women's)
The OMM Ltd Rosa Vest (Women's) is a lightweight, packable, and high-performance insulated vest, ideal for cold-weather endurance athletes, fast-packers, and mountain runners. Weighing just 125g, it features 40g PrimaLoft® Gold with Cross Core Technology for exceptional warmth-to-weight performance, even when wet. A wind and water resistant outer shell enhances protection, while the women’s-specific fit, full-length YKK zip, loose-fill collar baffle, and zipped hip pocket ensure comfort and functionality. When not in use, it packs into its own pocket for easy carry, making it the perfect layering essential for fast-moving adventures.
INOV8
Racepac 4
The INOV8 Racepac 4 is a unisex running hydration pack designed for shorter training runs and races up to half marathon distance. With a 4-litre capacity, it provides ample space for all your essentials. The front pockets comfortably hold two 500ml soft flasks, while the rear compartment fits a 2-litre hydration bladder (flasks & bladder sold separately). There's also extra space for nutrition and energy gels to keep you fuelled on the trails. Stay hydrated, energised, and comfortable with the Racepac 4, the perfect companion for trail runs and outdoor adventures.
INOV8
Racepac 8
The INOV8 Racepac 8 is a lightweight, zero-bounce hydration pack designed for ultramarathons and long-distance trail runs. Its 8-litre capacity accommodates two 500ml soft flasks in the front and a 2L hydration bladder in the rear (sold separately), offering up to 3 litres of fluid storage. Four quick-access pockets keep essentials handy, including a zipped pocket with a bungee loop for valuables. The breathable air-mesh wicks away sweat, while adjustable chest and waist bungees ensure a secure, bounce-free fit. With two trekking pole attachments, the Racepac 8 delivers optimal storage, hydration, and comfort for endurance athletes.
INOV8
Active Tights Women's
The INOV8 Active Tights Women's are high-stretch, quick-drying running tights designed for everyday training. Made with 70% recycled polyester and brushed elastane, they offer soft-touch comfort, full freedom of movement, and a higher waist for a secure fit. Featuring a no-bounce phone/gel pocket and a rear zip pocket, they keep essentials secure while you run. Reflective detailing enhances visibility on trails and roads, making them a must-have for winter training.
OMM Ltd
Ultra Bladder 2.0l
The OMM Ltd Ultra Bladder 2.0L is a lightweight, durable, and leakproof hydration system for runners, hikers, and outdoor enthusiasts. Compatible with all OMM packs, it features a fast-flow bite valve with a shut-off, a wide slide-top opening for quick, spill-free filling, and an internal baffle to reduce sloshing. The flexible, non-kinking tube ensures steady flow, while the leakproof disconnect system prevents drips. With a fill scale for tracking and BPA, PVC, and phthalate-free materials for safe hydration, it’s built for any adventure.
OMM Ltd
Ultra Flexi Flask 350ml with Bite Valve - Twin Pack
The OMM Ltd Ultra Flexi Flask 350ml with Bite Valve (Twin Pack) is your go-to hydration upgrade for running, hiking, and fast-paced adventures. Each 350ml soft flask is made from tough yet flexible TPU that compresses as you drink, so there’s less bounce and more comfort on the move. The bite valve straw gives you spill-free sips, while the wide opening makes refilling and cleaning super easy, and they’re BPA-free too.