Use code HOLIDAY20 for 20% OFF one full-priced item*
FREE SHIPPING over $50
Free Shipping Over $50*
Get free shipping, on most items, with your $50 purchase today! Same day shipping on most orders if placed by 3pm PST.
This offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and some exclusions apply.
Some large and/or heavy items are subject to additional oversize charges that are separate from standard shipping costs.
Bike Build Process
All bikes are built, tested, tuned, and ready to ride upon shipment. The bike build process typically takes 2-3 days to complete depending on the bike model and the complexity of the build.
Orders for in-stock items placed by 3PM PST usually ship on the same day. Orders that include special-order or backordered items may be subject to shipping delays depending on product availability. Refer to estimated delivery times in cart when selecting shipping options.
We strive to get you the gear you want at a competitive price. If you find an item we offer from a competitor at a lower price, let us know. We will do our best to instantly match their price. To qualify for the Price Match, your purchase must meet the following conditions:
Price Matches may only be honored on identical items. The product must be the same make and model (i.e., the same size, color, year, etc.).
The identical items must be in stock and ready for immediate delivery at the competing dealer.
Price Matching voids any currently advertised Jenson USA promotions or special offers (i.e. free shipping, free headset...). If the competitor offers free shipping on the specific item, Jenson USA will still match the price and free shipping offer.
The product must be brand new. We do not Price Match refurbished or used items.
Our Price Match Policy is valid only for qualified Internet retailers.
The competing dealer must be an authorized US retailer for the brand. This means that the manufacturer lists this dealer as an authorized and official retail web site.
The competing online retailer's principle business must be located within the United States.
Our Price Match Policy does not combine with any competitor’s coupons, rebates, promotional offers, or product-combo deals on your order.
Some items may not be eligible for price match due to manufacturer pricing requirements.
The Price Match Policy is subject to change at any time.
If you have any questions regarding a Price Match, one of our Gear Advisors will be happy to lend you expert guidance via phone, email, or chat.
Price Matches made post-purchase will be refunded via gift card
Bell’s 4Forty Air Mips Helmet is built to deliver pro-level features at a real-world price point. The 4Forty Air features massive ventilation ports to keep you cool as you fly down the trail, then climb back up. Thanks to the easily adjustable Float Fit™ system with integrated Sweat Guide and Ionic+ padding, the 4Forty Air has the all-day comfort you need. The MIPS® Evolve technology delivers industry-leading rotational crash protection, while the helmet's extended rear coverage offers added protection. Dedicated eyewear port and goggle compatibility allow you to run your favorite eyewear setup easily. Take to the trails with the Bell 4Forty Air Mips Helmet.
Highly ventilated shell design for increased airflow on climbs and descents
Float Fit™ system allows for easy adjustment
Sweat Guide pulls moisture away from your brow and away from your eyes
Ionic+ padding fights odor-causing bacteria
MIPS® Evolve technology is integrated into the helmet's retention system and offers industry-leading protection from rotational forces in a crash
Goggle and eyewear compatible with integrated storage solutions
Fusion-In-Mold Polycarbonate Shell
Head Circumference (cm)
52 - 56cm
55 - 59cm
58 - 62cm
61 - 65cm
Head Circumference (in)
20 - 22"
21.6 - 23.2"
22.8 - 24.2"
24 - 25.6"
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CALIFORNIA PROPOSITION 65 WARNING: This product can expose you to chemicals including (Cadmium, Phthalates, Bisphenol, Nickel (Metallic), di(2-ethylhexyl)phthalate "DEHP"), which is known to the State of California to cause cancer and/or cause birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
Q & A
Most items SHIP SAME DAY if ordered by 3pm PST and FREE SHIPPING on orders over $50. Please note that oversize charges may still apply on some heavy or large items and free shipping does not apply to PO Boxes.
1-day free standard Shipping on most orders to California, 2-day free standard Shipping on most orders to Nevada, Arizona, & Utah. Other states can expect delivery within 3 to 5 days.
Jenson USA ships worldwide, including APO/FPO addresses. For a more specific shipping quote and transit time estimate, simply add the items you are interested into your shopping cart and look for the "Shipping Options" box at the top of the cart page. You don't have to login or create an account to see shipping charges and time in transit estimates.
Some manufacturers restrict where we can ship their products. If this item has shipping restrictions, they are listed below. If you'd like to buy an item that we cannot ship to your address, we can accept your foreign credit card and ship it to a US address for you.
Due to manufacturer restrictions, this product cannot be shipped to the following locations:
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