How to choose the size of a ski helmet? Head measurement, fit, MIPS

Wondering how to choose the right ski helmet size? A poorly fitting helmet can be too tight, shift around while skiing, or fail to provide adequate protection. Learn how to interpret size charts and find the perfect fit.

How to choose a ski helmet size?

Choosing a helmet is one of the most important aspects of putting together your ski equipment. The right model protects your head, improves riding comfort, and allows you to focus solely on technique and trail conditions. The basis is always accurate head circumference measurement. This is the only starting point that allows you to compare the result with the manufacturer's size chart. Measure with a soft tape measure, keeping it horizontal, about 1 cm above your eyebrows and just above your ears. This is the widest part of your head and determines the helmet size.

Even at this stage, many people make the mistake of using an old helmet as a guide or choosing a size "by eye." However, each manufacturer uses its own shell molds, and the differences can be noticeable even with the same sizing (S, M, L).

How to read the manufacturer's size chart?

After measuring, you should compare the result with the size chart of a specific premium brand. Typical ranges are:

• S: 52-55 cm,
• M: 56-58 cm,
• L: 59-61 cm.

However, these are indicative values. Always treat the manufacturer's chart as a reference, not a universal rule.

• If your measurement is on the border between two sizes, the decision depends on how you like to wear your helmet. A larger size will work well if you plan to ski with a thin hat or balaclava.
• Once the helmet is on, adjust it with the adjustment system. Set the dial at the back so that the helmet sits evenly and does not slip when you move your head. Adjustment usually allows for a slack reduction of 1-2 cm.
• Adjust the straps. Fasten the chin strap so that one finger (about 1.5-2 cm) fits between the strap and your chin. The strap should not pinch, but it also cannot be too loose.

Children's helmet

For a children's helmet, it's worth considering models equipped with a size adjustment system that allows the helmet to adapt to the child's growing head. For the youngest, the head circumference is also measured 1 cm above the eyebrow line. The most common sizes range from 48-56 cm.

How to check for proper helmet fit?

A properly fitted ski helmet sits comfortably on the head without pressure or excessive looseness. Check its stability by moving your head from side to side, forward, and backward. The helmet should not slip or rotate. Pressure in one spot means it's too tight, while noticeable looseness or shifting indicates too large a size.

• Fasten the chin strap so that one finger fits between the strap and your chin, and the side straps form a V-shape just below your earlobe. Adjust their length so they don't cause discomfort.
• Then adjust the helmet circumference using the dial or inserts – the adjustment elements should stabilize the helmet without localized pressure. If adjustment doesn't help, consider a different size or model.
• Put on your ski goggles with the helmet and check their compatibility. No gap between the helmet and goggles indicates a good fit. The goggle strap should not push the helmet, and the field of vision must remain unobstructed.
• Also pay attention to the back of the helmet. It should not rub against your neck or jacket collar, and the helmet should not lift during sudden head movements.

What is the MIPS system and is it worth considering?

More and more skiers are paying attention to the presence of the MIPS system (Multi-directional Impact Protection System) when buying a helmet. This technology reduces rotational forces acting on the head during angled impacts. This means an additional level of protection, especially in situations that cannot always be predicted on the slopes.

MIPS consists of a thin, movable layer placed inside the helmet, between the shell and the lining. During an impact, this layer can shift by a few millimeters relative to the shell, so that part of the rotational energy is not transferred directly to the head, but is dissipated inside the helmet. It is worth considering this system if you ride freeride, compete, or are just starting to ski on steep slopes.

However, remember that the effectiveness of MIPS depends on the proper fit of the men's or women's helmet – head circumference, adjustment, and stability during movement.

Moreover, this system does not replace safety standards, but only complements them. A helmet with MIPS must still meet EN 1077 or ASTM F2040 standards. The helmet shell, i.e., the material it is made of, determines how effectively it protects against impacts and how durable it will be in use. It also affects weight and wearing comfort. The materials used in helmet shell production are most often:

• polycarbonate – provides high strength with a thin, lightweight shell,
• ABS – creates a harder and thicker shell, which translates into greater mechanical resistance and usually longer lifespan, but weighs more than polycarbonate and withstands long-term stress better.

FAQ – frequently asked questions

How to choose a ski helmet size if my measurement is on the border of two sizes?

If you prefer a more athletic fit, choose a smaller size. If you plan to ski with a thin hat or balaclava, a larger size will be better.

Is the adjustment system enough if the helmet is too big?

No. Adjustment corrects slight looseness, but it cannot replace the correct shell size.

Is a helmet with MIPS safer?

Yes, it offers additional protection against rotational forces, but only when properly fitted.

How often should a ski helmet be replaced?

After every serious impact and when it no longer fits well or shows signs of wear.

How to check helmet-goggle compatibility?

Put on your goggles with the helmet. The top edge of the helmet should meet the goggles without large gaps or pressure. Too large a gap can cause fogging, too much pressure shortens the lifespan of the lenses.