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Description
xThe jammer cut sits at the thigh, reducing drag and keeping everything in place throughout long training sets. A close, compressive fit helps muscles feel supported stroke after stroke. This is a silhouette trusted by competitive swimmers at every level.
The Still Black colourway is sharp, clean and pairs with any club kit or training gear. Black is the practical choice for regular pool use, resisting the visible fading that can affect bolder colours over time. It looks as good on session one as it does on session one hundred.
Funky Trunks designs its training range to withstand the demands of frequent pool sessions. The construction is intended to hold its shape and compression through repeated use and rinsing. Swimmers who train multiple times a week need a suit that keeps pace with them.
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 sizing can differ from standard clothing sizes, so it is worth checking the measurements before ordering. See Funky Trunks Mens Size Guide for full guidance on finding your fit.
The Still Black Training Jammer is designed for training rather than competition. It does not carry World Aquatics approval for sanctioned race events, so if you need a suit for competition you should look at Funky Trunks or Funky Trunks race-approved options.
Training jammers from Funky Trunks are built for repeated pool sessions and will hold their shape and compression with regular use. Rinsing the suit in clean water after each swim will help preserve the fabric and extend its life. See full product aftercare guide for full care guidance.
Jammers offer thigh-length coverage that reduces drag and provides a more secure, compressive fit than a brief or trunk. Many swimmers find them more comfortable for longer sets and they are widely accepted at clubs and public pools.
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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