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Best Running Shorts For Marathon Training Under £100 UK

We track 4 running shorts for marathon training under £100 on Amazon UK, priced from £15.75 to £25.54. Half of them sit at or below £19.99. 4 brands are represented, 1 listing each. The cheapest is the adidas Men's Adizero Essentials Running Shorts, Black, L, the dearest the TYR Sport Men's Swim Short/Resistance Short Swim Suit. That is 4 of the 40 running shorts we list in total. Ranking is by verified rating and review volume — never by commission.

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Prices and availability are accurate as of the date shown and may change. Always check the current price on Amazon UK before buying.

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Why these picks

  • Ordering is mechanical: customer rating first, then review count, then a stable tie-break. Commission is not an input, and no listing can pay for a position.
  • 0 of the 4 listings carry a customer rating. Unrated listings are not hidden — they sort to the bottom, where you can still see them.
  • Prices and availability were last read from Amazon UK on 2026-11-01; 1 of the 4 was in stock at that point. Always check the live page before buying.
  • The overall length of the shorts is a primary factor in determining their suitability; longer lengths are better suited to warmer conditions and slower-paced activities.
  • The material's weight impacts comfort and performance – lighter fabrics will be cooler but less durable, while heavier materials offer greater abrasion resistance.
  • Pocket design dictates functionality; zippered pockets provide superior security for valuables, while open pockets are simpler but more vulnerable.
  • The cut of the shorts – slim-fit, relaxed, or athletic – significantly affects movement and fit. A snug fit will be better for speedwork, whereas a looser fit is preferable for longer runs.

Buying guide

What to look for

Fit and Range of Motion

Running shorts are designed for movement, so the cut needs to allow a full range of motion without feeling restrictive. Consider how you'll be using them – a fast sprint requires more freedom than a longer, slower run. Pay attention to the leg length; shorter styles can feel constricting if they ride up too high.

Material Comfort

The material's ability to wick moisture and its softness against the skin are key factors. Breathable fabrics will help regulate temperature during your run, while a comfortable fit prevents chafing. Look for blends that offer both performance and comfort – avoid overly thick or stiff materials.

Pocket Placement & Security

Pockets are essential for carrying essentials like keys or gels. Consider the size and location of pockets; larger pockets can swing awkwardly during movement, and placement should be secure to prevent items falling out. Check if they're zipped or poppered.

Length Considerations

Shorts length is largely about personal preference and intended use. Shorter styles are common for speedwork but may not offer enough coverage for longer runs or when off the bike. Longer lengths provide more protection from sun and insects, while still allowing movement.

Common mistakes

  • Buying Shorts That Are Too Short for Your Legs: Many buyers assume shorter lengths are universally better. However, if you have longer legs, very short shorts will ride up and cause discomfort or require constant adjustment. Measure your inseam to find a suitable length – consider the amount of coverage you need.
  • Ignoring Waistband Elasticity: A waistband that is too loose can slide down during runs, while one that's too tight restricts movement. Look for adjustable waistbands (drawcords) for optimal fit and comfort.
  • Over-Reliance on Pockets: While pockets are convenient, excessive reliance on them can create bulk and affect the shorts' overall performance. Consider if you really need all those pockets – a single zippered pocket may be sufficient.
  • Selecting Heavy Fabrics For Summer Runs: Thick fabrics trap heat and reduce breathability, making them uncomfortable during warmer weather. Choose lightweight, breathable materials designed for warm-weather activity.

Frequently asked questions

How much do running shorts for marathon training under £100 cost in the UK?
The 4 running shorts for marathon training under £100 on this page run from £15.75 to £25.54, averaging £21.56. Half of them are listed at or below £19.99. Amazon UK prices move, so treat these as the figures at the last catalogue refresh rather than today's shelf price.
Which brands make running shorts for marathon training under £100?
4 brands appear in this selection: Adidas (1), Asics (1), Berghaus (1) and TYR (1). The number in brackets is how many listings each has here, not a ranking of the brands themselves.
How many running shorts are for marathon training under £100?
4 of the 40 running shorts we list — about 10%. Everything outside that 10% is still on the main running shorts page; this page is a filtered view of it, not a separate catalogue.
What does 'DWR' stand for?
DWR stands for Durable Water Repellent. It's a coating applied to the fabric that causes water to bead up and roll off, protecting you from light rain. However, it doesn't make the shorts waterproof.
How do I measure my inseam?
Measure from the crotch point to where you want the shorts to end on your leg. Use a soft measuring tape and ensure it's level for an accurate measurement. This is crucial for determining the correct length of the shorts.
Are elasticated waistbands adjustable?
Most elasticated waistbands feature a drawcord at the side, allowing you to cinch them tighter or looser as needed to achieve a comfortable and secure fit. Check the product details for specific adjustment features.

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