The Specialised S-Works Prevail 3 Black/Chrome is a top-of-the-line road helmet that keeps you safe while also keeping you cool and comfortable, especially on hot days and when you're climbing a lot.
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Cooling and ventilation

Large open "thru-air" channels take the place of many of the usual foam bridges. This gives the helmet about 24.5% more ventilation surface area than the previous S-Works Prevail II Vent, making it one of the most ventilated helmets Specialised has ever made.  The design is meant to keep air moving across the whole head during slow, steep climbs and fast rides. This makes it perfect for summer, mountainous routes and riders who get hot.
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Technology for safety and impact

AirCage uses woven aramid "cables" that run through the helmet and are attached to carbon fibre side panels. This suspension-bridge-like structure helps spread force more evenly when there is an impact, instead of just relying on EPS foam.
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The Integrated MIPS Air Node (MIPS' most ventilation-focused solution) creates a low-friction layer in the padding to help manage rotational forces during a crash. The helmet gets a 5-star Virginia Tech safety rating on many test lists.
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Fit, comfort, and features

You can fine-tune how the back of the helmet sits on your head and change the angle to make it easier to wear sunglasses with it.  The new Mindset micro-dial fit system and thinner Tri-Fix straps are meant to make the straps quieter, more comfortable around the ears, and easier to adjust while riding.
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Building, weight, and use case

The Black/Chrome colorway has a precision full-wrap polycarbonate shell over the EPS structure for strength and a clean finish.  The claimed weights are about 250-260 g for the smaller sizes and about 290-300 g for a size M/L, this puts it firmly in the lightweight premium road helmet category.
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Who it works best for

Best for people who mostly ride on roads or gravel, want a light helmet that still has modern safety features like MIPS and a high independent safety rating, and want the most airflow possible.  The S-Works Evade 3 is usually the brand's more aerodynamic option for flat, fast racing. The Prevail 3 is better for heat, climbs, and everyday performance.