How a Local Tennis Club's Choice of Dark Uniforms Masked a Growing Health Issue
When Eastbrook Tennis Club ordered a bulk run of dark navy shirts and shorts for their 420 members, the decision seemed sensible. Dark colours looked sharp, coordinated with the club crest and, several committee members pointed out, did a good job of hiding court dust and grass stains. The kit rollout cost the club £8,700 and was celebrated at the summer open day.
Within two seasons, routine observations from coaches and a few concerned parents suggested a different story. Players were getting more frequent sunburn complaints, older juniors were showing inflamed skin irritation along shoulders and necks, and a small cluster of slip incidents on the clay courts pointed to build-up of fine grit. A club nurse recorded 23 sunburn incidents and 12 coach-treatable heat-related symptoms across one high-sun summer. That triggered a quick internal review and a short study across 90 days to find out what was really happening.
The Skin and Surface Problem: Why Dark Kits Concealed Dust and Increased Sun Exposure
At first glance the problem looked like two separate issues - dirt on kit and sun safety. In practice both tied back to a combination of material choice, colour, laundering habits and player behaviour.
- Dark polyester fabrics tended to mask visible dust and sweat stains, so players washed kits less often. The club's survey found average washes fell from 2.2 times per week to 1.1 times per week per player once the dark kit was adopted. Repeated sweat, salts and skin oils reduce fabric UPF - the protective ability of textiles to block ultraviolet radiation. With fewer washes, the effective UPF dropped by an estimated 30% in field tests the club organised. The dark colour choice increased thermal absorption on sunny days, nudging players to remove layers or choose short sleeves, increasing exposed skin time. On-court wearable temperature sensors registered mean skin temperature 0.9 C higher during afternoon sessions for players in dark kits versus a control group in light, UPF-certified shirts. Dark fabrics masked dust and fine grit, which allowed grit to accumulate on shoulder seams and cuffs. That grit then transferred to skin, causing irritation and, in a few cases, micro-abrasions that intensified sunburn severity.
The combination created a deceptive picture: dark kits looked cleaner, so players felt fine about less frequent washing and grabbing a match on the hottest days. In practice that behaviour raised the club's actual UV risk and increased skin irritation incidents.
An Evidence-Based Sun Safety Strategy: Recolouring Kits, UPF Fabric and Behaviour Change
budget padel outfitThe committee debated options - a pure education push, introducing scheduled laundry of club kit, selling more sunscreens at the clubhouse, or redesigning the kit entirely. Rather than a single fix, they adopted a three-part strategy based on measurable outcomes: change the kit design and fabric to make dust visible and increase UPF, add policy nudges to improve laundering, and deploy practical sun-protection tools on site.
Decision points
- Swap dark polyester for a light-coloured, breathable blend with certified UPF 40+ rating on shirts and 30+ on shorts. Mandate a minimal laundering frequency for club-issued kit and subsidise a low-cost washing service for juniors. Provide broad-brimmed caps and UV-rated arm sleeves as optional add-ons, and install shaded benches at courts 1-4. Run a short monitoring period with wearable UV wristbands and temperature dots to collect hard data before and after.
That approach combined product change, policy and data collection - all aimed at shifting the behaviour that produced the unwanted outcomes.
Implementing the Sun-Safety Overhaul: A 90-Day Rollout
The club created a tight timeline to keep momentum high. The entire overhaul was rolled out over 90 days, with clear milestones and responsible leads.
Days 1-14 - Baseline MeasurementHanded out 50 wearable UV wristbands and temperature stickers to a representative sample of senior and junior players. Collected data on laundering frequency via a short survey and recorded incident numbers for comparison. Confirmed baseline: 23 sunburns, average washes 1.1 per week, mean wristband UV dose 2.6 units per afternoon session (where 1 unit equals a standard threshold defined by the manufacturer).
Days 15-30 - Product Selection and Supplier ContractsLab-tested three fabric samples. Chose a light stone-coloured polyester-cotton blend rated UPF 40 for shirts and UPF 30 for shorts. Ordered additional kit and negotiated a subsidised weekly wash for juniors via a local laundry - cost to club: £1.20 per item per wash.
Days 31-60 - Policy and InfrastructureIntroduced a short policy: players must wash club kit at least twice a week during peak summer months. Set up shaded seating, posted signage about peak UV hours, and stocked SPF 50 sunscreen at the clubhouse for free use before matches.
Days 61-90 - Re-measurement and Education PushDeployed wristbands and sensors again, surveyed players on comfort and behaviour, and tracked incident numbers. Ran two evening workshops for coaches and parents on sun protection and the role of laundering in fabric performance.
Throughout the period, staff logged costs, participation rates and qualitative feedback for the six-month report the committee planned to produce.
From 23 Sunburns to 4: Measurable Results in 6 Months
The club's hard data made the outcome clear. Here are the headline results collected over six months after implementation.
Metric Baseline (Before) After 6 Months Recorded sunburn incidents (season) 23 4 Average washes per player per week 1.1 2.6 Mean wearable UV dose per afternoon session 2.6 units 1.1 units Player-reported thermal discomfort (scale 1-10) 6.1 4.7 Club medical visits for skin/heat issues (season) 12 2Key observations that explain those numbers:
- Light-coloured, UPF-rated fabric reduced measured UV exposure by an estimated 57% when combined with increased laundering and sunscreen use. Visibility of dust and sweat on the lighter fabric created a small behavioural nudge - players chose to wash kit more frequently. The subsidised laundry for juniors removed a practical barrier. Shaded benches and free sunscreen increased on-site protective behaviours. Sunscreen usage recorded at the clubhouse tap rose from 18% of players pre-rollout to 69% post-rollout for matches played between 11:00 and 15:00. Players' subjective comfort improved as lighter fabrics reduced skin temperature and breathable blends increased moisture wicking.
Financially, the club spent roughly £3,400 on new kit and infrastructure and £1,100 on initial lab testing and monitoring devices. The reduced medical visits and lower kit replacement due to less salt-damage to fabrics produced an estimated net benefit within 18 months versus continuing the old approach.
3 Practical Lessons Every Sports Club Should Learn About Colour, Dirt and Sun Safety
Eastbrook's case offers lessons that apply beyond tennis clubs. These are practical, not preachy.
1. Colour affects behaviour, not just aesthetics
Light colours make dust and sweat visible, which may sound like a nuisance but prompts more frequent cleaning. That simple change increases the protective performance of clothing under the sun. Choosing fabric and colour together produces different outcomes than picking either in isolation.
2. UPF ratings matter, and they degrade
Fabrics with a certified UPF rating provide a quantifiable reduction in UV transmission. But detergents, sweat and abrasion can reduce UPF over time. Regular cleaning and avoiding heavy fabric softeners helps maintain protective qualities.
3. Combine product changes with small policy nudges
Product swaps rarely work by themselves. Eastbrook combined a visible design change with a small, enforceable policy and affordable laundry support for juniors. Those nudges closed the loop between intention and behaviour.
How Your Club Can Replicate This Sun-Safety and Laundry Strategy
If you manage a sports club, school team or community group, you can take a similar, staged approach without a large budget.
Baseline measurementGather a simple baseline. Use a short player survey for washing habits, log sunburn and medical incidents for a season, and borrow or buy a small number of wearable UV sensors if possible. You do not need a full lab - simple relative measurements across time are useful.
Small product testOrder sample fabrics in light and dark colours and check UPF ratings. Test them on a small group for comfort and laundering needs for 4-6 weeks. Keep records of washing frequency and anecdotal UV experiences.
Introduce nudgesUse low-cost nudges: clear signage about peak sun hours, free or subsidised sunscreen, a simple laundering requirement for club kit, and shade structures where feasible.
Re-measure and refineAfter a roll-out period (60-90 days), repeat the initial measures. Look for reductions in incidents and changes in behaviour. Use that data to refine policy or kit specs before committing to full replacement.
Quick self-assessment for club managers
- Do your current kits show dust and sweat clearly? (Yes / No) Do you track sunburn or heat-related incidents? (Yes / No) Do you have a laundering policy for club-issued kit? (Yes / No) Are any of your fabrics UPF-rated? (Yes / No) Do you provide shaded areas and free sunscreen? (Yes / No)
If you answered No to two or more, you have an opportunity to reduce risk with low-cost changes.
Mini Quiz - Test Your Sun-Safety Smarts
Which of the following reduces a fabric's UPF effectiveness the most?- A. Regular washing B. Accumulation of sweat and salts C. Choosing a lighter colour D. Hanging in shade to dry
Correct answer: B. Accumulated sweat and salts can reduce UPF. Regular washing restores protective performance.
True or false: Darker fabric always provides better sun protection than lighter fabric.Answer: False. Colour matters, but material, weave density and UPF certification are more important. Dark fabric may heat the wearer more, and if washed less, its UPF can decrease.
Eastbrook's experiment shows a surprising truth: what looks cleaner can hide problems. Dark colour hid dust, and that invisibility encouraged habits that reduced protection from the sun. Changing to lighter, UPF-rated fabrics and nudging better laundering proved more effective than simple sunscreen campaigns alone. The club now runs year-round workshops, keeps a small stock of UV wristbands for monitoring and includes fabric care in their new player welcome pack.
If you run a club, use the three-step framework above: measure, change the product and nudge behaviour. You will find that small, targeted shifts often yield big, measurable benefits for player health and comfort - and they make the clubhouse a nicer, safer place to play.