RUMBLE-is-the-thermoplastic-cross-helmet-with-a-racing-&-updated-shape-SHELL-in-reinforced-thermoplastic-resin-moulded-by-injection-Internal-polystyrene-in-two-sizes-M-&-L-INTERNAL-POLYSTYRENE-protective-lining-available-in-two-sizes-M-&-L-The-special-shape-&-construction-in-different-density-increases-mechanical-resistance-in-the-event-of-accidental-shock-Inner-channels-studied-in-the-wind-tunnel-guarantee-a-perfect-ventilation-The-D-RING-RETENTION-SYSTEM-has-been-designed-&-patented-by-Suomy-Insert-the-free-side-of-the-strap-in-the-rings-Pull-the-end-until-the-strap-presses-firmly-against-the-jaw-After-this-operation-it-should-not-be-possible-to-remove-the-helmet-Verify-that-by-grabbing-it-from-the-back-&-rotating-it-to-the-front-it-cannot-be-removed-&-it-is-fixed-to-the-head-If-the-helmet-tends-to-come-off-or-rotates-freely-tighten-the-strap-again-until-the-right-pressure-is-obtained-&-repeat-test-If-after-repeating-the-test-you-are-not-able-to-efficiently-tighten-the-retention-system-do-not-use-the-helmet-Only-after-checking-the-correct-tension-of-the-strap-fix-the-free-end-locking-it-with-the-automatic-stud-to-the-release-tab-The-automatic-stud-is-necessary-only-to-fix-the-free-end-of-the-strap-to-prevent-it-from-flapping-while-riding-Fixing-the-release-button-does-not-assure-that-the-helmet-is-correctly-in-position-&-properly-fastened-the-correct-locking-of-the-strap-must-be-verified-exclusively-following-the-above-paragraphs-RUMBLE-is-homologated-as-per-the-following-rules-ECE-22-05-DOT-CHEEK-PADS-completely-removable-&-washable-with-different-thickness-to-get-a-perfect-customization-of-the-helmet-INTERNAL-SHELL-completely-removable-&-washable-in-different-thicknesses-for-a-complete-customization-of-the-product-The-internal-removable-shell-has-been-studied-for-an-uniform-st&-on-the-head-The-visible-channels-allow-the-air-flow-to-check-the-temperature-in-the-internal-part-of-the-helmet-&-to-let-off-the-hot-air-through-the-back-part-The-shell-is-in-polystyrene-with-channels-for-air-flows-In-the-front-part-there-are-upper-&-back-air-ventilations-which-help-the-internal-helmet-ventilation-On-the-chin-guard-there-is-an-air-ventilation-for-the-front-ventilation-The-OUTER-SHELL-has-ribs-to-channel-better-the-air-flows-PEAK-adjustable-&-easily-replaceable-weigth-ca-1350gr