Gravity Back Base



Back protector designed for mountain biking, skiing, snowboarding and other action sports. Optimal safety with integrated removable protection. Based on the Switch Element System concept.

How to choose my backrest base



The back structure is the basis of our Switch Element System concept. It has been developed with the utmost care by an ergonomic engineer to offer the best possible fit and comfort.
No matter how much volume is zipped onto this base, the PRISM backpack provides maximum support on the back. It doesn't move and can be forgotten as it becomes one with the user.
The backpack base is supplied with a removable EN-1621-2 level 1 protection. The flexible back protector ensures optimal protection while remaining very light for the committed sportsman.

S/M: Bust size between 34 and 43 cms
L/XL: Bust size between 44 and 56 cms

Technical specifications
Sizes: S/M and L/XL
Dimensions: 54cm x 28cm x 5cm
Weight: base + back protector = 815g
Content: Nylon 210D R/S PU3 / N190 Taffeta
Colours: Grey Iron / Grey Storm

Summer volumes available:

Winter volumes available:

Equipment holders available:

Further information


L/XL: Bust size between 44 and 56 cm, S/M: Bust size between 34 and 43 cm


Mountaineering, Climbing, Motorcycle, Hiking, Snowshoeing, Skiing, Snowboarding, Urban, Mountain biking, Electrically assisted mountain biking


Androgynous: Ergonomic straps and waist belt, made of reinforced foam, whose ergonomics have been studied to adapt to both male and female morphologies.

Anti Spine-Blaster (ASB): Removable back protection. CE certified, EN 1621-2, motorbike standard. Weight: 300g.

ASB Pocket: Slot for removable back protector.

Comfy Paddy: 6 back pads and 2 lumbar pads to ensure maximum wearing comfort and perfect adhesion to the back, while allowing air to circulate.

Skinny Pock: Zipped pocket on the waistband so that nothing can stick out and catch on the branches.

Stern Sliders: 4 levels of chest strap adjustment: piping + metal buckle.

Water Hole: Opening for the pipette outlet.

Water Tray: Slot for hydration system - up to 3L - with 3 Velcro straps to accommodate any type of water bag (not included).

Zip Fit Half: Specific YKK zipper to join the back base and the PRISM Zip-On of your choice.

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