Troy Lee Designs A3 Uno MIPS Bike Helmet - Lightweight MTB & Road Cycling Helmet with Safety Protection for Men & Women - Perfect for Mountain Biking, Commuting & Urban Cycling

Troy Lee Designs 2025 A3 Bike Helmet Head of the class, the 2025 A3 helmet leaves nothing to chance by setting the modern standard in protection and fit as demanded by Troy Lee Designs' athletes. Equipped with Mips protection, the co-molded EPP/EPS design features sixteen vents to optimize airflow making for a helmet that is so comfortable it practically disappears on your head. Troy Lee Designs 2025 A3 Helmet Collection The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. 2025 A3 Helmet Merchant Video TLD Mountain Bike Helmets 2025 D4 Mips Helmet Add to Cart 2025 Stage Mips Helmet Add to Cart 2025 A3 Mips Helmet Add to Cart 2025 Flowline SE Helmet Add to Cart 2025 Flowline Mips Helmet Add to Cart Price $299.99$299.99 $319.99$319.99 $249.99$249.99 $159.99$159.99 $119.99$119.99 RIDER CATEGORY Midrange DH / BMX Race Premium full face enduro MTB / Enduro / Trail MTB / Trail / E-MTB MTB / Trail / E-MTB ROTATIONAL PROTECTION Mips C2 Mips C2 Mips B32 / retention system Mips B32 / retention system Mips B32 / retention system ADJUSTABLE VISOR Yes Yes 3-Way Magnajust visor 3-Way adj. screwless visor 3-Way adj. screwless visor IMPACT ABSORBING LINEAR EPS EPP / EPS EPP / EPS co-molded Dual Density EPS EPS FIT SYSTEM RETENTION One size 3 chk pads,2 hdlnr,3 neck roll Full 360 w/ micro ratchet adj. Full 360 w/ micro ratchet adj. Full 360 w/ micro ratchet adj. WEIGHT 1150 grams 690 grams 415 grams 375 grams 375 grams BUCKLE D-Ring 3D Fidlock Magnetic buckle 3D Fidlock Magnetic buckle 3D Fidlock Magnetic buckle Pinch clasp closure VISOR SCREWS Smart shear w/ ano alum washer Smart shear w/ ano alum washer Smart shear Screwless design Screwless design SHELL Polyacrylite 2-piece: microshell/polylite 3-piece advanced layer PC PC Microshell PC Microshell VENTS 16 22 16 14 14 What is Mips ? Mips is a safety technology that adds a low-friction layer inside the helmet that can move slightly during an impact, helping to reduce the rotational force on the head and lowering the risk of brain injury. What is B-Series Mips? A Rotational Brain Protection co-molded into a retention system. What is EPP? EPP (Expanded Polypropylene) is a closed cell foam used in helmets that can withstand multiple impacts. What is EPS? EPS (Expanded Polystyrene) is a lightweight foam material used in helmets for various action sport activities. Can I purchase helmet accessories and parts separately? Yes. We offer a full range of replacement parts, including visors, padding, and more. Troy Lee Designs 2025 A3 Helmet Tech Features So comfortable you’ll never take it off. The A3 mountain bike helmet is the standard in premium mountain bike helmets with luxurious comfort, patent-pending innovations in safety, ventilation that will keep you cool on the longest climbs with comfort and coverage to protect you on the sketchiest of descents. Highest possible score (5-STAR) from Virginia Tech helmet safety lab so you can feel confident in all conditions. The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. video Merchant Video Troy Lee Designs A3 Never Take It Off: Brendog & Olly What's more relaxing than a spa day? A spa day with the A3 Helmet. The A3 Helmet is so comfortable you'll never take it off, just ask Brendan Fairclough and Olly Wilkins. The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. video Merchant Video Troy Lee Designs A3 Never Take It Off: Vali Höll At home with Vali Höll in beautiful Austria for another relaxing day of yoga, chill time, and her daily sauna routine all in the A3 Helmet. It's so comfortable you'll never want to take it off. The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. video Merchant Video Troy Lee Designs A3 Never Take It Off: Rob Warner So comfortable you'll never want to take it off. Rob Warner, the voice of MTB, likes to surround himself with ultimate comfort, but nothing compares to the luxury of the A3 Helmet. The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. video Merchant Video Troy Lee Designs A3 Never Take It Off: Steve Peat For the legend Steve Peat, the ultimate post-ride relaxation is pouring a drink, throwing on some comfortable slippers, hopping in this favorite chair next to the fire, and wearing his A3 Helmet. The A3 Helmet is so comfortable, you'll never take it off. The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. video Merchant Video