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Description
xAt least 60% of the Powerskin ST Next fabric is made from recycled yarns, making this the first-ever World Aquatics approved racing suit for girls built with sustainability at its core. The recycled construction does not compromise on speed or feel. You get race-ready performance and a reduced environmental footprint in a single suit.
The new fabric is significantly lighter than previous generations, which directly reduces water absorption and drag in the pool. The specific fibre characteristics deliver longer-lasting compression so the suit maintains its performance shape across training blocks and multiple race days. Greater durability means this suit keeps working as hard as the swimmer wearing it.
Low-profile seams sit flush against the skin for a precise, chafe-free fit that allows excellent freedom of movement through every stroke and turn. Reinforced shoulder straps add comfort and structural integrity during competition. Greater support and compression across the core and legs promotes increased power output and a more streamlined position in the water.
Not sure on sizing? See our Arena Powerskin ST Next Girls Size Guide or ask our swimwear experts for advice.
← Scroll to see all sizes →
| Size | 22 | 24 | 26 | 28 |
|---|---|---|---|---|
| International Size Equivalents | ||||
| UK | 22 / 6–7 yrs | 24 / 8–9 yrs | 26 / 10–11 yrs | 28 / 12–13 yrs |
| USA | 22 | 24 | 26 | 28 |
| France / Italy | 6–7 yrs | 8–9 yrs | 10–11 yrs | 12–13 yrs |
| Germany (height cm) | 116 | 128 | 140 | 152 |
| Germany (height cm) | 45.5 | 50.5 | 55.0 | 60.0 |
| Body Measurements (cm) | ||||
| A: Chest | 58–62 | 64–68 | 70–74 | 76–80 |
| B: Waist | 54–56 | 56–58 | 58–60 | 60–62 |
| C: Hip | 66–68 | 70–74 | 76–80 | 82–86 |
| D: Torso Loop | 110–120 | 120–125 | 125–130 | 130–135 |
| Body Measurements (inches) | ||||
| A: Chest | 22.8–24.4 | 25.2–26.8 | 27.6–29.1 | 29.9–31.5 |
| B: Waist | 21.3–22.0 | 22.0–22.8 | 22.8–23.6 | 23.6–24.4 |
| C: Hip | 26.0–26.8 | 27.6–29.1 | 29.9–31.5 | 32.3–33.9 |
| D: Torso Loop | 43.3–47.2 | 47.2–49.2 | 49.2–51.2 | 51.2–53.1 |
All measurements are body measurements, not garment measurements. Inches measurements have been mathematically converted from cm (divide by 2.54). For further guidance view our full size guide or ask our swimwear experts.
Yes. The Arena Powerskin ST Next is World Aquatics approved, making it legal for use in sanctioned competitive swimming events at all levels.
Arena race suits are cut close to the body for maximum compression and typically size differently from training suits. We recommend consulting our Arena Powerskin ST Next Girls Size Guide before ordering to find the best fit.
At least 60% of the fabric is made from recycled yarns. This makes the Powerskin ST Next the first-ever World Aquatics approved girls racing suit to be manufactured with recycled fabric content, without any compromise in speed or compression performance.
Proper aftercare is essential to preserve the compression and fabric integrity of any race suit. Please refer to our full product aftercare guide for full guidance on rinsing, drying and storing your Powerskin ST Next.
View our full swimwear product aftercare guide to ensure you look after your race suit 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 the Arena Powerskin ST Next Girls’ Kneesuit — the next generation of Arena’s iconic ST racing suit and the first ever World Aquatics (FINA) approved racing suit made with recycled fabrics. Made from over 60% recycled fibre from waste yarns, the ST Next delivers sustainable performance without compromise. Features an open-back style with reinforced shoulder straps for comfort.
The new fabric is significantly lighter and faster than its predecessor, absorbing less water and reducing drag for longer-lasting compression and enhanced durability race after race. Designed with low-profile seams for perfect fit and outstanding freedom of movement, plus UV protection (50+ UPF). The perfect tech suit for the next generation of junior swimmers. All measurements are body measurements taken directly from your child’s body. Use the Torso Loop (D) as the primary sizing guide.
Shop Arena Girls’ Racing Kneesuits →
Take all measurements directly against your child’s skin using a soft tape measure. Use the Torso Loop (D) as the primary sizing guide — this determines how the suit sits across the shoulders and through the body. Age is shown as a guide only.
If measurements fall between sizes, speak to a member of staff at Allens who will be happy to advise on the best fit.
| Sizing | 22 | 24 | 26 | 28 |
|---|---|---|---|---|
| International Size Equivalents | ||||
| UK | 22 / 6–7 yrs | 24 / 8–9 yrs | 26 / 10–11 yrs | 28 / 12–13 yrs |
| USA | 22 | 24 | 26 | 28 |
| France / Italy | 6–7 yrs | 8–9 yrs | 10–11 yrs | 12–13 yrs |
| Germany (height cm) | 116 | 128 | 140 | 152 |
| Body Measurements (cm) | ||||
| A — Chest | 58–62 | 64–68 | 70–74 | 76–80 |
| B — Waist | 54–56 | 56–58 | 58–60 | 60–62 |
| C — Hip | 66–68 | 70–74 | 76–80 | 82–86 |
| D — Torso Loop | 110–120 | 120–125 | 125–130 | 130–135 |
| Body Measurements (inches) | ||||
| A — Chest | 22.8–24.4 | 25.2–26.8 | 27.6–29.1 | 29.9–31.5 |
| B — Waist | 21.3–22.0 | 22.0–22.8 | 22.8–23.6 | 23.6–24.4 |
| C — Hip | 26.0–26.8 | 27.6–29.1 | 29.9–31.5 | 32.3–33.9 |
| D — Torso Loop | 43.3–47.2 | 47.2–49.2 | 49.2–51.2 | 51.2–53.1 |
Age ranges are a guide only. All measurements are body measurements, not garment measurements. Use the Torso Loop (D) as the primary sizing guide. Speak to a member of staff at Allens if you are unsure.
Watch our guide to measuring for the Arena Powerskin ST Next Girls' Kneesuit.
Measure your child’s chest (A), waist (B), hip (C), and torso loop (D) using a soft tape measure directly against the skin. Use the Torso Loop (D) as the primary guide and compare all measurements to the sizing table above. Age is shown as a guide only — always use body measurements as children develop at very different rates. Speak to a member of staff at Allens if you are unsure.
The Torso Loop is measured by running a soft tape measure over one shoulder, down the front of the body, under the crotch, and back up to the same shoulder. This is the most important measurement for a kneesuit as it determines how the suit sits across the shoulders and through the body.
Always select by body measurements. The age ranges shown are a guide only — children develop at very different rates and age alone is not a reliable indicator of the correct size. Measure the chest, waist, hip, and torso loop and compare to the sizing table, using the torso loop as the primary guide.
A junior racing kneesuit should feel firm and compressive but comfortable throughout a full competition day. It should be completely wrinkle-free when correctly fitted — any bunching or gathering indicates the suit is too large. The straps should sit flat on the shoulders with no pulling, and leg hems should end above the knee in line with World Aquatics regulations.
Yes — both the Arena Powerskin Impulso and ST Next Girls’ Kneesuits meet FINA/World Aquatics specifications and are approved for use in all sanctioned competitive swimming events. Always check with your event organiser for any local age group rules regarding tech suits in competition. Speak to a member of staff at Allens if you need further guidance.
If your child’s measurements fall between two sizes, speak to a member of staff at Allens who will be happy to advise on the best fit. Arena racing kneesuits are designed to fit closely — a suit that fits correctly should feel firm and supportive without restricting breathing or movement.
Arena racing kneesuits are competition suits and are not designed for regular training use. Using a tech suit for training will degrade the fabric and reduce its lifespan significantly. Reserve it for races and competition warm-ups. Arena offer a wide range of junior training swimsuits for everyday pool use.
Rinse the suit in cold fresh water immediately after every use. Do not machine wash, tumble dry, iron, or dry-clean. Store flat and dry, away from direct sunlight. Avoid contact with sunscreen, oils, and petroleum-based products. Do not wring or twist the suit. Handle with care when putting on and taking off to protect the fabric.
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