Santini H21 Acquazero winter jersey – review

The winter jersey is a staple piece of kit and this warm and water resistant H21 Acquazero jersey from Santini delivers versatile performance in a clean, minimal, no-fuss style.

The jersey is made from a ‘thermofleece’ fabric, so it has a soft, brushed fleece lining on the inside and it offers plenty of warmth as a mid-layer, on top of a base layer and beneath a jacket, on freezing winter rides, or as a standalone outer layer for a quick hour’s ride or in milder winter temperatures. Santini state a temperature range of eight to 15 degrees – what exactly works for you will depend on how warm you run.

The fabric has had a ‘water resistant’ Acquazero treatment, subscribing to the trend in recent years for winter jerseys which provide some protection against damp weather, without the bulk of a full rain jacket. In damp conditions the Acquazero fabric works fairly well in repelling moisture, though it will absorb moisute in consistent rain and heavy downpours. Santini claim water resistance up to 60 minutes, obviously dependent on level of deluge, and this is a piece best for damp or changeable conditions, rather than days which are consistently wet.

The wicking levels and breathability of the fabric is good, ensuring a minimal amount of moisture build up, which reduces the chance of catching a chill on a descent when the jersey is used as an outer layer, particularly as fabric is not windproof.

The jersey doesn’t feel bulky in use, and the microfleece interior is soft to touch and is barely noticeable when riding. The jersey is a snug fit and is anatomically cut for the riding position. The good cut ensures there isn’t any bunching or flapping areas of fabric, making the jersey look and feel sleek and trapping extra warmth due to the minimal air space. It’s cut correctly, with a lower tail, and feels great when riding, regardless of position on the bike or effort.

Arm length is spot on and, while I’ve slightly long arms, it wouldn’t be too long otherwise and the cuffs sit well and are nicely finished. The waist hem has a silicone strip and an elasticated microfibre gripper to ensure the jersey stays in place and sits flush. The sleeves also have a microfibre cuff to provide a secure fit over gloves.

Details include a small, soft piece of fabric that prevents the zip (which is water resistant) rubbing on the neck or chin. The three pockets are deep, easily accessible and not overly baggy, even when well loaded with tools, tubes, food and such. Unusually there is no zip pocket – the pockets are deep so buried keys are ok, but money can be a struggle to locate. An additional zipped pocket for valuables would be useful.

Otherwise the jersey, which is available in three colour options of blue, red and black, has few frills, just helpful little details like the reflective piping on the arms, which is always useful in winter and low light conditions.


Simple but versatile winter jersey, which is warm and breathable, with added water resistance.

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