Product Colors and Sizes

Special product, Innovation Special product, New Release Special product, Special product, Sale

Boxing and Martial Arts Mouthguard Size L 100

Sale price: $4.00 Regular price: $4.99
Color: Select a color
Size: Select a size
Sale price: $4.00 Regular price: $4.99

Free returns

Free shipping over $30

Free pickup

San Francisco, 735 Market St. Options

Select an available color and size to see options.

Model: 8505014

Product Videos

Product Features

A photo of the Boxing and Martial Arts Mouthguard Size L 100 in use

Boxing and Martial Arts Mouthguard Size L 100 is designed for reducing the risk of mouth injury when doing combat sports (boxing, martial arts).

Thermoforming mouth guard for adults doing boxing and martial arts (boxing, Muay Thai, kickboxing, full-contact karate, taekwondo). Complies with the new XP S72-427 standard.

Shock protection

Complies with the new XP S72-427 standard

Easy breathing

2 mm ventilated space to let air circulate as you exercise.

Anatomical design

Heat-moldable for a perfect fit.

Puncture resistant

Single layer of material 5 mm thick.

Product Lifestyle Image Gallery

Image Gallery

Boxing and Martial Arts Mouthguard Size L 100,cyan

Product Customer Reviews

Skip to reviews
566 Reviews
Write a Review 

Boxing and Martial Arts Mouthguard Size L 100,cyan
Filtered by reviews Loading reviews…
One adult size does not fit all

There should be more sizes and the one and only adult size is very poor fitting.

icon-circle-checkmark verified purchase
Hello Ming Neo,

Thank you for the review about our product: "100 Boxing and Martial Arts Mouthguard Size L - Clear".
We indeed value your honest feedback, and we will certainly relay these collated feedback to our Design & Brand Team for their reference in their continuous improvement efforts. Thank you so much for taking time to let us know of your suggestion(s) & opinion(s). They are very valuable to us. We hope to see you soon, when our Stores are allowed to  be re-opened, hopefully soonest. 
Meantime, stay safe and take care, Ming Neo.

Stay healthy, keep fit & stay happy at home, during this circuit-breaker time!

Sports Advisor
Decathlon Singapore

"Keeping Fit Through Sports - and Decathlon!"
Better than expected


icon-circle-checkmark verified purchase
mouth guard

A robust mouth guard that is able to withstand direct hit from your partner without causing cuts to your own lips. The material however is generally too thick for the typical Asian dental feature.

icon-circle-checkmark verified purchase
Hey Paik!

Thank you for the great feedback! We are glad that you enjoyed your buy! Please do continue to write a review for our products, as it helps us to improve our range and cater more to your needs! I will pass this information to the brand for them to take note when coming out with new products.

Keep a look out on our new range that will be in stores by February! Hope to see you soon!

Keep hustlin'
Low quality

Good for nothing but if you want your teeth to be replaced soon with just one punch then go but this for sure.

icon-circle-checkmark verified purchase
Dear Mr.Lakshit,

Firstly we deeply regret for the inconvenience caused. We will definitely highlight this feedback to our production team to improve the product further. However you can always exchange this product to your nearest Decathlon store if you feel the product is defect. 

Thanks for reviewing our product. And once again we regret the inconvenience caused !! 

With Regards,
Too big

This is way too big, it hurts my jaw!

Thanks for your opinion on Mouthguard Size L - Black. I'm sorry to hear about your issue with the size of the mouth-guard. We do have the size S as well or, in the new models 500, even the M. I suggest you to try with one of those smaller size
Don't forget you can claim a total refund or a product change in your nearest Decathlon store
Kind regards

Poor fit and cannot use

the fit was totally wrong after shrinking the guard with hot water. not possible to fit teeth into the groove and was very uncomfortable. I think you need to improve on the design of the guard.

Hi Ming!

Thank you for your review regarding the 100 Boxing and Martial Arts Mouthguard Size L - Clear.

I understand your concern and frustration and I sincerely apologize for it. To the best of my understanding, each and every products that Decathlon sells have gone through a rigorous and thorough research & development process including numerous product tests. This is to ensure consistent product quality and to filter any products that does not meet intended performance standards.

I would like to invite you to any of our 4 Decathlon Experience stores for a product exchange. I would love to meet you in person and extend my service to you. See you around soon Ming :)

Your sporty friend,
Omnichannel Sports Advisor | Joo Koon
Very bad product

I bought a mouthguard for the second time at decathlon because the first one i thought i had messed up as the product would not stay on the upper tooths and was way too big for the under teeth. So i bought it for the second time to see if it would make a difference if i would exactly follow the instructions, same result! What a waste of my money , TWICE! How can you sell a product that does not do its work, even with the instruction video you can see that the product is way to big. Really dissapointed !

Thanks  a lot to send us your opinion on  100 Adult Mouthguard. I'm sorry to hear all your trouble to fit the mouth-guard. Your kind of feedback are very useful for our product managers in order to design and produce better products.
Don t forget you can claim a total refund or a product change in one of our Decathlon store
Kind regards


Works well so very happy

icon-circle-checkmark verified purchase
Very poor fit - check end of video on this page!

For the very cheap price I thought I'd try one of these for a laugh after deciding to do a bit of sparring after a long absence. Following the application instructions to the letter I'm left with at least 6mm extra plastic at the bottom below my teeth, hence not fitting at all and falling out. You can see for yourselves how very badly this mouthguard fits the model in the Decathlon video on this page, he's got more mouthguard below his teeth than actually on them, mine is exactly the same. I wouldn't waste time returning but it shall be going in the bin & I'm off to the dentists to get a proper one, that actually fits. Waste of time and money.

Thanks for let us know your opinion on 100 Adult Mouthguard. This kind of very detailed feedback are really important for us in order to develop better products that can meet your expectations and be useful to practice boxing. I ll pass it to our R&D department.
Thanks again and sorry for any problems caused by the item
Kind regards

100 adult mouthguard

Used by our son, 12 years old, for PE lessons at school. Relatively straight forward instructions to follow to mould to teeth.

icon-circle-checkmark verified purchase

Have tried various mouthguards for my 13 year old and this is the best he has tried

icon-circle-checkmark verified purchase

Buen producto

icon-circle-checkmark verified purchase
Está excelente

Pues está muy comodo y se retira fácilmente

icon-circle-checkmark verified purchase
Protector outshock 100

Se acopla bien, precio economico

icon-circle-checkmark verified purchase

Muy buen producto

icon-circle-checkmark verified purchase
Skip to reviews

Additional Product Information



  • 100% Polypropylene


  • 100% Ethylene vinyl acetate


  • 100% Polypropylene

New, safer design

Our mouthguard complies with the new XP S72-427 standard, which stipulates the following features: - Thicker to prevent perforation. - Built-in breathing channel so that you can breathe even when your jaw is closed. - Meshing of the upper and lower teeth to more effectively hold the jaw in place (protection against fractures). -A gum covering to stop the teeth from coming loose.

Which size should you choose?

S: User is 3'7" to 4'7" tall (CHILD) M: User is 3'7" to 4'7" tall (CHILD) M: User is over 4'7" tall

Directions for use

Always wear your mouthguard during training sessions and competitions. To mold your mouthguard correctly, soak it in boiling water for exactly the amount of time it says on the instructions. This time will be indicated in the instructions and may vary from model to model. Watch the video tutorial to find out how to mold your mouthguard. To guarantee good protection, your mouthguard should stay in place when you open your mouth.

Care instructions

Wash in fresh water. Leave to dry naturally before putting it back in its storage box (original box). For optimal protection, replace your mouthguard at least once per year or as soon as it starts to show signs of wear.

Care advice

Wash in fresh water. Leave to dry naturally before putting it back in its storage box (original box). For optimal protection, replace your mouthguard at least once per year or as soon as it starts to show signs of wear.



Storage instructions

Store your mouthguard in its case (sold with the product).

Superior quality. Unbeatable prices.

For 40 years, Decathlon has delivered the best value in the retail sports industry by offering high-quality, sustainable and cost-effective products.

Decathlon makes the difference
  1. product-research

    Research and development

    delivers high-quality cost-effective products

  2. State-of-the-art production processes

    minimize manufacturing costs

  3. Optimized supply chain

    reduces retail prices

  4. laptop-checkout

    Minimal retail footprint

    lowers overhead and indirect costs