My 10 yo wears age 11-12 underwear he has a chunky bottom but is slim every where else, which would be best age 9-10 or 11-12?

Hi, I bought my 9 year old the 11-12 he’s very slim but he had grown out of the 9-10 .I think the fits are small so maybe try 11-12 there is a draw cord to tighten if loose .hope this helps

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Speedo Boy's Endurance+ Jamer Swiming Trunks | Training | Chlorine Resistant | Quick Drying | Stretch Fabric | Comfort Fit

Product ID: 415675444

⚡quick-dry tech

♻️50% recycled fabric

🏊‍♂️100% chlorine resistant

₩58735

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Description

♻️ Swim Clean, Swim Fast – The Future of Training Trunks!

TRUSTED LEGACY - From Speedo, the leader in swimwear since 1928, designed for champions in the making.
ECO CHAMPION FABRIC - Made from 50% post-consumer recycled polyester for a sustainable swim.
RACE READY QUICK DRY - Dries faster so your kid stays comfortable between laps and lessons.
STREAMLINED COMFORT FIT - Internal drawcord waist and medium stretch fabric for freedom of movement.
ENDURANCE GRADE DURABILITY - Super-durable material built to withstand intense training sessions.

Speedo's Boy's Endurance+ Jammer combines 100% chlorine resistance with quick-dry technology and eco-friendly recycled fabric. Designed for comfort and durability, it features a streamlined fit with an internal drawcord waist, making it ideal for young swimmers training hard or racing. Backed by Speedo’s legacy since 1928, this jammer is the top choice for performance and sustainability.

Specifications

Asin	B0F6NSBC33
Best Sellers Rank	1 in Competitive Swimwear Boys Jammers
Date First Available	28 April 2025
Department	Boy's
Item Model Number	8-13460
Manufacturer	Speedo

Reviews

User

Good price

It fits perfectly and good price decent quality

10.05.2026

User

Speedo quality

Speedo quality jammers for Grandson at the right price point. Fast delivery from 5* seller. He will only wear jammers not shorts, so these were great. Fit and wash well & perfect for any swimming activities

26.08.2025

User

True to size.

My son says they are comfortable. He’s 9 I got 11-12 because he’s in that size clothing. They are slightly big not tight around legs so I’ve ordered another pair in age 9-10. They are true to size.

31.01.2026

User

Good

These are good quality and fit perfectly. Lasted us a while. Very happy.

29.10.2025

User

True to size

Longer length swim trunks, true to size, elasticated waist as well as drawstring

9.08.2026

User

Excellent quality and fit

Excellent quality fabric, comfortable to wear. Lovely smart black colour. Stayed on when diving. Sizing- child is 10 and tall for his age and 150cm and fitted perfectly for the size guidelines (age 11-12)

11.08.2025

User

Great swimming shorts

Great swimming shorts at a really good price (bought on prime days). Fit perfectly and have a drawstring inside if too lose. My very slender 7 year old is wearing the 7-8 and they fit exactly as they should.

24.07.2025

User

Great

3.06.2026

User

Good fit.

These fit my son well , his a size 8.

6.11.2025

User

Maillot de bain

Matière de bonne qualité, mon fils de 14 ans l'a adorée.

26.08.2026

User

They are nice

Great quality. Good fit

20.09.2023

User

Best priced Speedo

Best price for Speedos

30.08.2025

User

Very beautiful

Very useful thanks

13.11.2023

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₩58735

Duties & taxes included

In stock

Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Korea.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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