Wis. Stat. § 901.053
Evidence of use or nonuse of protective headgear by a person, other than a person required to wear protective headgear under s. 23.33(3g), 23.335(8) (a) or (b), or 347.485(1), who operates or is a passenger on a utility terrain vehicle, as defined in s. 23.33(1) (ng), a motorcycle, as defined in s. 340.01(32), an all-terrain vehicle, as defined in s. 340.01(2g), or a snowmobile, as defined in s. 340.01(58a), on or off a highway, is not admissible in any civil action for personal injury or property damage. This section does not apply to the introduction of such evidence in a civil action against the manufacturer or producer of the protective headgear arising out of any alleged deficiency or defect in the design or manufacture of the protective headgear or, with respect to such use of protective headgear, in a civil action on the sole issue of whether the protective headgear contributed to the personal injury or property damage incurred by another person.
Wis. Stat. § 901.053