Back Protectors
From FIS Freestyle wiki

9.1 Definition
The back protector is an additional item of equipment, which protects the athlete’s back against weather and external forces. The use of back protections is recommended.
Specifications
The back protector must adapt to the anatomical bend of the athlete’s spine and lay flat against the body. The top edge of the back protector has to be situated in the area of the spinal column. Fastening of the back protector may take place with a stomach belt, straps or suspenders. The maximum thickness has to be in the middle part and may not exceed 45 mm; the thickness reduces towards the edges of the back protector. The back protector may be worn exclusively under the competition suit.
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