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Description
xDesigned for fitness training and active swims, the Endurance+ Jammer from our Essentials range is a Speedo classic. Built for comfort and durability using our Endurance+ performance fabric, it resists chlorine and pilling for long-lasting wear. An internal drawcord provides an adjustable fit, and the jammer is front-lined for comfort and modesty. Body made of 53% polyester, 47% PBT.
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 the Speedo Mens Global Alpha Size Matrix, a unified international sizing system covering 11 sizes based on waist measurement. International equivalents are provided for GB, D, F, I, Lat Am, AUS, USA, CAN and MEX size systems. Sizing is based on body measurements — use your waist and hip measurements alongside your usual GB waist size to find the most accurate fit.
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Use a soft tape measure and take all measurements directly against the skin. Body measurements are the most reliable way to find your correct size.
If measurements fall between sizes, size up. Use waist as the primary guide for jammers and swim shorts.
| Size | 65cm / 26 | 70cm / 28 | 75cm / 30 | 80cm / 32 | 85cm / 34 | 90cm / 36 | 95cm / 38 | 100cm / 40 | 105cm / 42 | 110cm / 44 | 115cm / 46 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| International Size Equivalents | |||||||||||
| GB | 65cm / 26 | 70cm / 28 | 75cm / 30 | 80cm / 32 | 85cm / 34 | 90cm / 36 | 95cm / 38 | 100cm / 40 | 105cm / 42 | 110cm / 44 | 115cm / 46 |
| D | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| F | 34 | 36 | 38 | 40 | 42 | 44 | 46 | 48 | 50 | 52 | 54 |
| I | 40 | 42 | 44 | 46 | 48 | 50 | 52 | 54 | 56 | 58 | 60 |
| Lat Am | Talla 26 | Talla 28 | Talla 30 | Talla 32 | Talla 34 | Talla 36 | Talla 38 | Talla 40 | Talla 42 | Talla 44 | Talla 46 |
| AUS | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 | 26 |
| USA | 26 | 28 | 30 | 32 | 34 | 36 | 38 | 40 | 42 | 44 | 46 |
| CAN | 26 | 28 | 30 | 32 | 34 | 36 | 38 | 40 | 42 | 44 | 46 |
| MEX | 26 | 28 | 30 | 32 | 34 | 36 | 38 | 40 | 42 | 44 | 46 |
GB size is shown as waist measurement in cm and inches. USA, CAN and MEX sizes are identical across all sizes in this range.
| Size | 65cm / 26 | 70cm / 28 | 75cm / 30 | 80cm / 32 | 85cm / 34 | 90cm / 36 | 95cm / 38 | 100cm / 40 | 105cm / 42 | 110cm / 44 | 115cm / 46 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Body Measurements (cm) | |||||||||||
| Waist* (cm) | 63–68 | 69–74 | 75–79 | 80–84 | 85–88 | 89–93 | 94–98 | 99–103 | 104–108 | 109–113 | 114–118 |
| Hips** (cm) | 80–85 | 86–92 | 93–97 | 98–102 | 103–106 | 107–111 | 112–116 | 117–121 | 122–126 | 127–131 | 132–136 |
| Size | 65cm / 26 | 70cm / 28 | 75cm / 30 | 80cm / 32 | 85cm / 34 | 90cm / 36 | 95cm / 38 | 100cm / 40 | 105cm / 42 | 110cm / 44 | 115cm / 46 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Body Measurements (inches) | |||||||||||
| Waist* (inches) | 24.5–26.5 | 27–29 | 29.5–31 | 31.5–33 | 33.5–34.5 | 35–36.5 | 37–38.5 | 39–40.5 | 41–42.5 | 43–44.5 | 45–46.5 |
| Hips** (inches) | 31.5–33.5 | 34–36 | 36.5–38 | 38.5–40 | 40.5–41.5 | 42–43.5 | 44–45.5 | 46–47.5 | 48–49.5 | 50–51.5 | 52–53.5 |
*Waist is measured 5cm down from the natural waist at the narrowest point. **Hips are measured 10cm down from the natural waist around the widest point. All measurements are body measurements, not garment measurements. Scroll horizontally to see all sizes.
Measure your chest, waist (5cm down from natural waist) and hips (10cm down from natural waist) and match to the body measurements table. You can also use your usual GB waist size in cm or inches to locate the right column, then confirm using the body measurement rows.
Speedo's Global Alpha size matrix defines waist as measured 5cm below the natural waistline, which corresponds more closely to where the waistband of a jammer or swim short actually sits. Measuring at the natural waist will give a different figure, so follow the 5cm guideline for the most accurate size selection.
In the Speedo Mens Global Alpha matrix, GB size is expressed as actual waist measurement in centimetres and inches (e.g. 80cm / 32), while USA, CAN and MEX sizes use the same numeric sizing (26, 28, 30 etc.) which happens to match the waist measurement in inches. All three are identical across every size in this range.
Use your waist and hip measurements as the primary guide. The GB size columns are expressed as waist measurements in cm and inches, so find the column that matches your waist size and confirm using the body measurement rows. If your waist and hip suggest different sizes, waist takes priority for jammers and swim shorts.
The smallest size is 65cm / 26 (chest 80 to 85 cm, waist 63 to 68 cm) and the largest is 115cm / 46 (chest 132 to 136 cm, waist 114 to 118 cm). Not all sizes are available in every style — check the individual product listing to confirm which sizes are stocked.
These are European regional size systems. D refers to German sizing, F to French sizing, and I to Italian sizing. Each uses a different numeric scale to represent the same body measurements. Use the international equivalents table above to cross-reference your usual size in any of these systems.
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