Alpinestars A-4 Plasma Black Red White Chest Protector

The Alpinestars A-4 Plasma chest protector in the Black Red White version protects back and chest with materials designed for intense off-road riding. The Nucleon PLASMA back, the semi-rigid chest shell and the vented 3D mesh frame aim for a good balance between protection and ventilation.

Main features

• Nucleon PLASMA back, a viscoelastic compound with at least 25% biobased content.
• Semi-rigid thermoplastic polyhedral chest shell.
• Vented 3D mesh frame; flexible overmoulded sides.
• Removable thermoformed shoulder pads and removable rib and shoulder padding.
• Adjustable shoulder and side straps.
• Compatible with the BNS system; optional Race kit (Y-strap) for use without the back protector.
• CE level 1: back EN 1621-2:2014, chest EN 1621-3:2018. Sizes M/L, XL/XXL.

Safety and approval

The chest protector is CE certified level 1: back protection to EN 1621-2:2014 and chest protection to EN 1621-3:2018, as stated by the manufacturer. Always check the label of the product you receive.

Fit and sizes

This product is available in sizes M/L, XL/XXL. To choose your size, measure your chest (or your leg, for knee braces) and compare it with the manufacturer’s size chart; if you are between two sizes, contact us before buying and we will help you choose the most suitable one, taking into account what you will wear over and under it.

Who it is for

This chest protector is designed for motocross and off-road riding, in training and racing. The vented frame and the adjustments make it suited to long sessions that call for protection and freedom of movement.

Care and maintenance

Clean the product with a damp cloth and mild detergent, without bleach. Where applicable, remove the protectors before washing and let it air dry away from direct heat. Check straps, buckles and seams regularly and replace the protectors after a significant impact. Rinse off sweat residues after a hot session to keep the fabrics fresh.

Why choose it

A motocross protector only works if it stays in the right place while riding. That is why adjustability, low weight and ventilation matter: the best protection is the one you are happy to wear for the whole session, from the first moto to the last.

If you need help choosing the size or pairing the protector with the rest of your gear, our team will gladly answer your questions.

A practical tip: try the protector on with the clothes you will really wear and move your arms, torso and legs in riding positions. It must not shift or restrict movement, but stay firmly over the areas to protect. A correct size is essential so that the protection works in the right place in a fall. Check that straps and buckles close without twisting before every ride.

Product sold by STOP AND GO, specialist in motorcycle clothing, helmets and protection: for advice on size and use, our team is at your disposal.