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Description
xECO C-Infinity is the same superior quality polyester construction you’ve come to trust from the original C-Infinity fabric, but manufactured from end-of-life plastic water bottles. It delivers 100% chlorine resistance and exceptional colour fastness, giving new life to waste and reducing environmental impact. You get the brightest swimwear on the market without the environmental cost.
With wide 16.5cm sides, a drawcord waist, and a full front lining, this is the tried-and-tested trunk cut that serious pool swimmers rely on. The wide elastic leg opening keeps things comfortable and secure whether you’re doing laps or lounging poolside. It’s the no-fuss silhouette that simply works.
The Putty Rules print has been produced via the latest direct digital printing technology, which means it is better for the environment as there is minimal wastage and water consumption in the printing process. High definition colour fastness ensures the vibrant design holds up session after session in chlorinated water. Bold looks that last as long as the fabric itself.
Not sure on sizing? See our Funky Trunks Mens Size Guide or ask our swimwear experts for advice.
← Scroll to see all sizes →
| Size | XS | S | M | L | XL | XXL |
|---|---|---|---|---|---|---|
| UK | 30 | 32 | 34 | 36 | 38 | 40 |
| US | 30 | 32 | 34 | 36 | 38 | 40 |
| AUS | XS / 30 | S / 32 | M / 34 | L / 36 | XL / 38 | XXL / 40 |
| France | 1 | 2 | 3 | 4 | 5 | 6 |
| Body Measurements (cm) | ||||||
| Chest (cm) | 86–92 | 92–97 | 97–103 | 103–108 | 108–113 | 113–118 |
| Chest (inches) | 34.0–36.0 | 36.0–38.0 | 38.0–40.5 | 40.5–42.5 | 42.5–44.5 | 44.5–46.5 |
| Waist (cm) | 75–80 | 80–85 | 85–90 | 90–95 | 95–100 | 100–105 |
| Waist (inches) | 29.5–31.5 | 31.5–33.5 | 33.5–35.5 | 35.5–37.5 | 37.5–39.5 | 39.5–41.5 |
| Hips (cm) | 80–85 | 85–90 | 90–95 | 95–100 | 100–105 | 105–110 |
| Hips (inches) | 31.5–33.5 | 33.5–35.5 | 35.5–37.5 | 37.5–39.5 | 39.5–41.5 | 41.5–43.5 |
All measurements are body measurements, not garment measurements. For further guidance view our full size guide or ask our swimwear experts.
Funky Trunks size these trunks to waist measurement: XS fits a 28 to 30 inch waist, S fits 30 to 32 inches, and M fits 32 to 34 inches. For a full breakdown of measurements, see our Funky Trunks Mens Size Guide.
No. The ECO C-Infinity fabric is 100% chlorine resistant and the Putty Rules print is produced with direct digital printing technology for high definition colour fastness, so the design should hold up through daily pool use without noticeable fading.
ECO C-Infinity matches the performance of Funky Trunks’ original C-Infinity fabric in chlorine resistance and colour vibrancy, but it is manufactured from end-of-life plastic water bottles rather than virgin polyester. The fabric is milled in Italy and gives a new life to waste material, reducing the environmental impact of your swimwear.
Rinsing the trunks in cool, clean water immediately after each swim is the single most effective step you can take to prolong the life of the fabric and print. For full guidance, visit our full product aftercare guide.
View our full swimwear product aftercare guide to ensure you look after your kit properly.
Allens Swimwear is a family-run business founded in 1976 by Dennis Allen and his daughter Linda Beal. It started from a genuine need. “With 2 swimmers in the family it was often difficult to find the right kit, so dad and I took the plunge and started selling to local swimmers at our local pool in Kingsbury out of a suitcase and we’ve never looked back.” Today, Linda, her husband Richard, and three of their children Danny, Will and Jenna still run the business together. The suitcase may be long gone, but the founding principle of helping swimmers get the right kit remains exactly the same.
Shipping & Returns
xUK Delivery Options
🚚 Free UK Delivery
Free delivery on all orders over £40
For orders below £40, delivery charges will be displayed at checkout.
The total order value, including any deals or discounts (such as a discount code), must be over £40.
📮 Royal Mail
📦 UPS
🚀 DHL Courier
🏪 In Store Collection
Free in store collection is available. Simply choose this option at checkout and pick up your order at our store.
🕐 Delivery Times
EU Delivery Options
✈️ FedEx
International Delivery Options
🌍 International Shipping
📮 Royal Mail
🚀 DHL Courier
Important Information
FAQs
We offer several delivery options, including Standard Delivery, Express Delivery, and International Shipping.
Delivery times depend on the option you choose at checkout. Standard Delivery typically takes 2–3 days, while Express Delivery is usually delivered within 1–2 days. International delivery times may vary by location.
Delivery costs vary based on the shipping method and destination. Standard delivery starts at £4.99, and express delivery starts at £14.99. International shipping rates are calculated at checkout.
Yes, we offer free delivery on orders over £40. Terms and conditions apply.
Yes, once your order is dispatched, you'll receive a tracking number via email to monitor its progress.
Yes, we deliver to many countries worldwide. Delivery times and costs for international orders are shown at checkout.
If your order hasn't arrived within the estimated timeframe, please contact us with your order number, and we'll assist you.
If you're not available, the courier will typically leave a card with instructions on how to rearrange delivery or collect your parcel.
We can make changes to your delivery address if your order hasn't been dispatched. Please contact us as soon as possible.
If your order arrives damaged or is incomplete, please contact our customer service team as soon as possible with photos and your order number, and we'll resolve the issue promptly.
Currently, we don't deliver to PO Boxes and BFPO addresses. Please check specific delivery options at checkout.
For express or special deliveries, you may be able to select a preferred delivery date at checkout.
Returns Policy
We offer a free returns service. We advise that customers keep either proof of posting or a receipt as we cannot be held accountable for items lost being returned to us.
Please note that this returns policy does not cover items such as special order swimwear, customised products and products ordered specifically at the request of a customer. Products such as these cannot be returned (unless faulty).
Free UK Returns
If you are unhappy with your purchase for any reason, then we will gladly refund you within 28 days of purchase. Simply click on the link below to begin the returns policy:
ALLENS OF KINGSBURY RETURNS
Returns outside of the UK are at the buyer's cost. Please return to us at the address below.
Please ensure that you have completed a CN22 Customs declarations form and that this has been clearly marked as being Returned Goods. Please mark the return parcel on the outside clearly as returned goods. Failure to do this could result in Customs charges being applied to the parcel on its return. I regret we cannot accept parcels with customs duties and charges payable — these will be returned to sender.
Non-Faulty Goods
Please return items with the original packaging if possible and to keep hygiene seals on suits, please also include a copy of the invoice received clearly stating on this that you would like a refund for the return.
Please note that we will not accept non-faulty items back that have been worn or without their relevant packaging, labels or stickers.
If you would like to exchange an item for an alternative size, style or item please follow the link to us along with a copy of your invoice, please note on the invoice what item is required as an alternative.
Faulty Goods
In the case of faulty goods, please contact us and provide details of the nature of complaint along with photos and the date of purchase and the care given to product.
In all cases of complaint we will endeavour to substitute faulty goods with an identical replacement, or substitute the goods with ones of similar value. This does not affect your statutory rights, and you may of course choose to have a complete refund if you are not 100% happy.
How to Return an Item
If you have any questions about delivery, please contact us.
Size chart
This size guide covers Funky Trunks Men's Training Swimwear, including the Classic Trunk, Sidewinder Trunk, Classic Brief, and Training Jammer. All styles are made from Funky Trunks' exclusive C-Infinity or ECO C-Infinity fabric — 100% Italian polyester with 100% chlorine resistance, high-definition colour fastness, and 50+ UV sun protection. Fabric milled in Italy.
Size based on chest, waist, and hip measurements. Funky Trunks men's swimwear is available in sizes XS–XXL (UK 30–40).
Shop Funky Trunks Men's Swimwear →
Measure in centimetres with a soft tape measure taken directly against the skin or over light underwear. Use all three measurements to find the best fit in the table below.
| Size | XS | S | M | L | XL | XXL |
| UK | 30 | 32 | 34 | 36 | 38 | 40 |
| US | 30 | 32 | 34 | 36 | 38 | 40 |
| AUS | XS / 30 | S / 32 | M / 34 | L / 36 | XL / 38 | XXL / 40 |
| France | 1 | 2 | 3 | 4 | 5 | 6 |
| Body Measurements (cm) | ||||||
| Chest (cm) | 86–92 | 92–97 | 97–103 | 103–108 | 108–113 | 113–118 |
| Waist (cm) | 75–80 | 80–85 | 85–90 | 90–95 | 95–100 | 100–105 |
| Hips (cm) | 80–85 | 85–90 | 90–95 | 95–100 | 100–105 | 105–110 |
| Size | XS | S | M | L | XL | XXL |
| UK | 30 | 32 | 34 | 36 | 38 | 40 |
| US | 30 | 32 | 34 | 36 | 38 | 40 |
| AUS | XS / 30 | S / 32 | M / 34 | L / 36 | XL / 38 | XXL / 40 |
| France | 1 | 2 | 3 | 4 | 5 | 6 |
| Body Measurements (inches) | ||||||
| Chest (inches) | 34–36" | 36–38" | 38–40" | 40–42" | 42–44" | 44–46" |
| Waist (inches) | 29–31" | 31–33" | 33–35" | 35–37" | 37–39" | 39–41" |
| Hips (inches) | 31–33" | 33–35" | 35–37" | 37–39" | 39–41" | 41–43" |
UK and US numeric sizes are equivalent. AUS sizes are shown as both letter and number. Use waist and hip measurements as the primary guide for trunks and briefs. If between sizes, speak to a member of staff at Allens.
Measure your chest, waist, and hips in centimetres and match to the size table above. UK sizing is the primary reference — US, AUS, and France equivalents are also shown. For trunks and briefs, use waist and hip as the primary guide. If your measurements fall between two sizes, speak to a member of staff at Allens for advice.
The Classic Brief has 16.5cm sides with a stitched front pouch and double lining — the widest cut and most supportive. The Classic Trunk has 14cm sides with a single front panel and full front lining — a versatile mid-length trunk. The Sidewinder is a brief-style cut with 8cm sides and full front lining — the most minimal option. The Training Jammer provides hip-to-knee coverage with flatlock stitching — designed for swimmers who prefer full-leg coverage during training.
C-Infinity is Funky Trunks' exclusive 100% Italian polyester fabric, offering 100% chlorine resistance, high-definition colour fastness, and 50+ UV sun protection. It is designed to retain its strength and durability far beyond other elastane swimwear fabrics, making it the superior choice for swimmers who train frequently. ECO C-Infinity is the same fabric manufactured from recycled end-of-life plastic water bottles.
The Funky Trunks Training Jammer is a training swimsuit designed for regular pool use and is not a World Aquatics-approved racing suit. For competitive racing, a FINA-approved race suit is required. The Training Jammer is, however, an excellent choice for club training, squad sessions, and performance-focused training where hip-to-knee coverage is preferred.
Rinse in cold fresh water after every session to remove chlorine and salt. Allow to dry naturally away from direct sunlight — do not tumble dry or wring. The C-Infinity and ECO C-Infinity fabrics are 100% chlorine resistant and built for regular pool use. With proper care the prints and fabric will maintain their quality for longer.
For competitive training, the Training Jammer is the closest to a race-day fit, offering hip-to-knee coverage with flatlock stitching and a front pouch lining designed for speed and comfort. Swimmers who prefer a shorter cut for training often choose the Sidewinder or Classic Trunk. The Classic Brief suits swimmers who prefer wider sides and additional support. Speak to a member of staff at Allens if you are unsure which style best suits your training.
Flatlock stitching is a technique where the seams lie flat against the skin rather than forming a raised ridge. This minimises rubbing and irritation during training sessions, contributes to a smoother feel in the water, and is a hallmark of performance swimwear construction.
ECO C-Infinity is Funky Trunks' sustainable version of their C-Infinity fabric, manufactured from end-of-life plastic water bottles. It delivers the same 100% chlorine resistance, 50+ UV protection, and colour fastness as standard C-Infinity, while reducing environmental impact by repurposing waste plastics. It is used in the Training Jammer range.
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