my current back pad is 15.25" x 11.5". what size do i order?

I have the same dimension and large is way too big to fit in the back slot. Vertically, this item in a Large is 17 inches

I did not find its size, can you tell me the size of the large, medium and small? I don't know how to choose

Size Height Width Small 15 8.75 Medium 16.75 9.5 Large 17.75 10

why dont they list the size (dimensions) instead of the package size? Seriously??

Probably Because it comes in a small plastic bag that fits it really tight

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Alpinestars Nucleon Kr-Celli Back Protection Insert

Alpinestars Nucleon Kr-Celli Back Protection Insert

Product ID: 142509289

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Details

Color
Transparent
Brand
Alpinestars
Material
high polymeric
Sport
Motorcycling
Item Weight
0.3 Kilograms

⚖️Ultra-lightweight polymer honeycomb design

🌬️Advanced ventilation for all-day airflow

🛡️CE Level 1 certified impact protection

Description

🛡️ Ride smart, stay light, and never compromise on protection.

FEATHERLIGHT ARMOR - Crafted from cutting-edge polymer with a honeycomb micro-structure to keep weight minimal without sacrificing protection.
SEAMLESS INTEGRATION - Designed to fit perfectly with select Alpinestars jackets and suits for an effortless upgrade to your protective gear.
ERGONOMIC FLEXIBILITY - Triple segmented, 3D contoured design adapts seamlessly to your back’s natural curve and every riding position.
BREATHE EASY RIDE HARD - Strategic ventilation channels and breathable Airmesh fabric keep you cool even on the longest, most intense rides.
CERTIFIED SAFETY YOU CAN TRUST - CE Level 1 certification guarantees top-tier impact absorption for fearless rides.

The Alpinestars Nucleon KR-CELLi Back Protection Insert is a CE Level 1 certified, ultra-lightweight polymer back protector featuring a honeycomb cellular micro-structure for superior shock absorption and airflow. Its ergonomic, triple-segmented design adapts to rider movement, ensuring comfort and flexibility, while strategic ventilation channels and breathable Airmesh fabric keep riders cool. Compatible with select Alpinestars gear, it offers a premium safety upgrade for serious motorcyclists.

Specifications

Item dimensions L x W x H	7.87 x 7.87 x 7.87 inches
Age Range (Description)	Adult
Closure Type	Pull-On
Strap Type	Adjustable
Manufacturer	Alpinestars
Item Package Dimensions L x W x H	21 x 10.75 x 0.5 inches
Package Weight	0.48 Kilograms
Item Dimensions LxWxH	7.87 x 7.87 x 7.87 inches
Brand Name	Alpinestars
Warranty Description	2 Year Manufacturer
Model Name	6503919-L
Suggested Users	unisex-adult
Number of Items	1
Part Number	1696280103
Style	Motorcycle
Included Components	no
Size	Large

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¥24497

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