Smith Optics Mainline Mips Full Face MTB Cycling Helmet
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Product Description
Give credit where credit's due. Thank your mom, your legs, and your gear for giving you the opportunity to land that rocky gap. Made for going big, going fast, or both, the Smith Mainline is our pinnacle, downhill certified enduro bike helmet. Safety innovations like Koroyd™ and MIPS® provide energy-absorbing impact protection so you have the confidence to get aggressive on the trail. It doesn't matter if you're slaying the EWS in Whistler or suffering through the last stage of your local enduro race, you need a breathable, lightweight helmet that pairs well with goggles and fits like a glove. The Mainline integrates with your bike goggles for efficient venting and fog-free vision. Multiple pad sets including liners and neck-rolls let you customize the fit.
Key Features:
- 21 fixed vents for consistent airflow
- Adjustable visor
- Hybrid X-STATIC® / XT2® anti-bacterial performance lining for odor resistance
- Weight: (Size M, MIPS®): 27 oz / 77 g
- Sizes: S - 51-55cm, M - 55-59cm, L - 59-62cm
Protection
- Aerocore™ construction featuring complete Koroyd® coverage for lightweight, energy-absorbing and ventilated impact protection
- MIPS® Brain Protection System reduces rotational forces caused by angled impacts to the head
- CPSC CE EN 178 and ASTM F1952 downhill certified
Fit / Integration
- Designed for ultimate integration with Smith performance goggles for maximum comfort, venting and storage convenience
- AirEvac™ ventilation system integrates with Smith goggles for fog-free lenses
- Three washable cheek pad kits, two crown liners and two neck rolls let you fine tune the fit
- D-ring chin strap fastener for a snug fit
Occasionally, without notice, manufacturers change product design and/or specifications.
Smith Helmet Sizing
Smith Helmet Size Guide
Use the below chart and guide to find the correct size Smith helmet for you.
|
|
Head circumference (cm) |
|
S |
51 - 55 |
|
M |
55 - 59 |
|
L |
59 - 63 |
|
XL |
63 - 67 |
How to measure
To find the circumference of your head, place a tape measure in the centre of your forehead, wrap it around above your ears and around the back of your head. If there's a slight difference between two different sizes, always go for the tighter size.
Once you know the circumference of your head, see the available sizes shown on the product and select the appropriate one.
The majority of cycling helmets have some form of adjustment for size, usually in the form of a ratchet adjuster to tighten or loosen the straps, some helmets will also come with different thickness pads to further customise the fit.
Read our clothing size guide for more information on sizing.
Please note, all size information is provided as a guide - if you're unsure or need any further assistance you can call us on 01792 799508 ... we're happy to help!
Full Face Helmet Guide
Full Face Helmet Guide
Full Face Helmets
Full face helmets are designed for gravity mountain biking and BMX racing. With a chin bar and a thicker core than open face MTB helmets, full face lids are designed for high speed riding on challenging terrain. When it comes to protection, all our MTB helmets meet the minimum safety standard (CE EN 1078). Most full face helmets go much further than this with thicker cores and more durable shells as well as enhanced safety features like dual density cores and MIPS. Some full face helmets are designed to meet the international ASTM DH standards.
Full face helmets can be roughly split into two types; downhill or DH helmets and enduro helmets. Downhill helmets look similar to off-road motorbike helmets, with lots of internal padding and very few vents. Enduro helmets have a lot more venting and look like regular MTB helmets with an added chin guard, which is sometimes removable. The chin guard on enduro helmets is especially well vented to make breathing easier on climbs and traverses. This isn’t a definitive definition as many enduro racers wear DH helmets, while enduro helmets are becoming more popular with trail riders.
Features to look out for in a full face helmet:
Shell
The shell is the outer covering of a full face helmet. As well as the standard polycarbonate shell found on regular mountain bike helmets, full face lids sometimes features a fibreglass or carbon shell. The shell is moulded to the core and completely covers the helmet including the chin piece. The very best full face helmets have a carbon fibre composite shell that is lightweight as well as offering the best protection.
Core
Sitting directly under the shell is the Core. Like most cycling helmets the core is usually made from EPS foam. Sometime on high end DH lids EPP foam is used as this offers better multi impact protection. Multi density foam cores are sometimes used for improved impact protection at various speeds. While the shell of DH helmets strengthens the core, Enduro style full face helmets sometimes feature additional strengthening elements to compensate for all the extra venting that break up the integrity of the shell.
MIPS
A Multi-directional Impact Protection System (MIPS) is fitted between the helmet core and your head. This slip-plane technology reduces the rotational forces that result from certain impacts. Integrated into the fit system, MIPS is found on high-end MTB helmets and takes head protection to the next level. Some brands offer different slip plane technologies, like SPIN, that do the same thing as MIPS.
Fit & Straps
Full face helmets have two different fitting systems. Downhill helmets have similar fitting to motorbike helmets. Here the liner is extensive. It extends all the way around your head, with cheek pieces in the chin guard, so it grips your head effectively without the need for an adjustable fit system. Enduro style full face lids don’t tend to have so much padding, and may use an adjustable fit system like regular cycling helmets. This is sometimes supplemented with cheek pads for a firmer fit. Chin straps are there to keep your helmet in place even if you take a knock on the head. Again, there are two ways to do this; DH lids use a more secure D-ring style strap similar to those found on motorbike helmets, while enduro lids use a snap fit buckle.
Liner
The padded liner is the bit of the helmet that connects directly to your head. If you ride a lot, then features to look out for are removable, washable pads made from quick drying, hydrophilic and anti-microbial materials. These will help keep your head smelling sweetly on every ride.
Ventilation
Venting helps to keep your head cool while you ride by allowing air to move over your head as you ride. The venting on downhill helmets is minimal as you will be moving relatively fast when you ride which greatly improves airflow. Enduro style full face helmets have much more extensive venting as these are designed for climbing as well as descending. The rule of thumb for cycling helmets is that more and/or larger vents will increase the amount of airflow over your head. Vent position matters too. Vents close to the brow offer cooling where you need it most while vents in the chin guard are designed to aid breathing. Internal airflow channelling draws air in and circulates it around your head for more efficient cooling.
Removable chin guards
Enduro style full face helmets sometimes have removable chin guards. This means that you can take the chin piece off for extra cooling and easier breathing when climbing. Removable chin guards may not offer as much protection as a fixed one, although some full face helmets with removeable chin pieces are ASTM DH certified.
Visor
All full face mountain bike helmets have a visor to help keep the sun or rain out of your eyes. Most full face lids have an adjustable visor so you can push it out of the way for maximum visibility when you don’t need it.
Goggle Compatibility
Full face mountain bike helmets are all designed to work with goggles. However, as goggles are different shapes some will work better with a particular helmet than others. Some full face lids are designed to be compatible with specific brands or types of goggles but will usually work with others too.
Action camera mounts
With a dedicated action camera mount, you can attach your GoPro securely to your helmet. Break-away mounts are the safest way to attach your action camera.
It is important to get a helmet that fits correctly. Simply measure the circumference of your head and match it to the helmet size. Do this by placing a tape measure on the centre of your forehead and wrap it around your head above the ears. See our clothing size guide for more details.
Finance
Delivery & Guarantee
UK Delivery Information
International Deliveries – Temporarily Suspended 11/11/20
Note: We are still offering deliveries to the Isle of Man, Scottish Highlands, Scottish Islands, Channel Islands, Isle of Wight, Jersey and Guernsey.
Courier Delivery update: Due to the COVID19 situation, we are currently experiencing some delays with deliveries. Our couriers are working around the clock to get your order to you as soon as possible but there is a potential delay of up to 48 hours . Please check your tracking on track your order here.
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Please note on the TNT tracking app it may show your delivery status as ‘Collecting’ (as per image below). This means your delivery has left our warehouse and is currently held at TNT main depot and there could be up to a 48 hour delay.
Please keep checking the TNT tracking for further updates. On behalf of TNT we apologise for any delay and inconvenience this may cause.
We are committed to offering fast and free delivery, whether you're ordering bikes, accessories or clothing. Our standard delivery service is FREE in the UK, regardless of the size and on all orders over £20.
Please note that bulky products and bikes shipped to outlying UK regions are excluded from free shipping.
Please note that Pre-Order dates can sometimes change due to updated stock information.
Click here for more UK and international delivery information.
Returns & Warranty
It's easy to return a product with our 365 day, hassle free returns.
We will give you a full refund on any item that is returned to us unused/unfitted, in a resaleable condition and in its original packaging (where possible).
Please note: For hygiene reasons, we cannot accept returns of facemasks, undershorts or underwear if the item has been removed/unsealed from its original packaging.
If your item develops a fault or arrives damaged, please contact us first so we can resolve the issue for you as quickly as possible.
For more information please visit our Returns & Warranty page.
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