From sweaty climbs and windswept ridgelines to pouring rain, the UL All-weather Long Hoody keeps you moving without stopping to change layers.

Made entirely from Pertex Shield Air, it is significantly lighter and more breathable than conventional air-permeable waterproof shells. The airflow is so exceptional that it feels more like a fully waterproof wind shell than traditional rainwear.

At just 130g in Size S—less than half the weight of a typical rain jacket and pants combined—its relaxed fit provides an open, unrestricted feel, bringing a new sense of freedom to hiking in the rain.

The UL All-weather Long Hoody offers overwhelming breathability compared to conventional rainwear. It has evolved into a new product category we call “All-weather Activewear” equally suitable for sunny and rainy days.

Its excellent ventilation performance lets the heat out and keeps you dry when running or going uphill, even when normal rainwear is too humid and warm to wear. The 10,000mm water pressure resistance will protect you from getting wet in case of sudden rain.

The chart below shows a comparison between the UL All-Weather Series and general mountaineering rainwear (assumed to be products weighing 200-300g that use breathable waterproof membranes such as Gore-Tex).

General rainwear tends to have excellent insulation, but poor breathability and a tendency to trap heat. However, the UL All-Weather Series is lightweight, highly breathable, and does not trap heat even during intense activity.

However, due to its high breathability, the UL All-Weather Series may sometimes make the wearer feel cold in strong winds. Therefore, proper layering is necessary when using it to ensure warmth.

What sets Pertex Shield Air apart from conventional waterproof-breathable fabrics is that it does more than allow moisture vapor to escape—it lets air pass directly through the fabric. This movement of air creates Shield Air’s exceptional airflow.

The secret lies in its nanofiber structure. While conventional waterproof-breathable membranes are typically film-based, Shield Air consists of ultrafine fibers layered into a web-like structure. The countless microscopic gaps between these fibers create pathways for air, allowing built-up heat to escape.

This unique structure delivers the ventilation needed to keep moving comfortably in any weather.

The UL All-weather Long Hoody is designed for hikers who love shorts.
It is long enough to wear without rain pants, and its relaxed fit achieves unparalleled comfort. It is like a paper-thin, flexible layer gently covering you and your shorts.

The area around the neck part is nice and spacious and the side slits are added for ease of wearing and for easy access to your pockets.

Weighing only 130g in size S, the Long Hoody is about half the weight of a normal set of rain jacket and rain pants, making your backpack lighter and more compact.

A relaxed fit through the body and around the neck allows heat and moisture to escape efficiently while moving.

Both sides have deep slits for easy wearing, which allow for direct access to your pants/shorts pockets.

The Long Hoody is especially convenient if worn together with our 5-pocket series pants/shorts, and all five pockets can be directly accessed from the slits.

Usually, the stitching of the rainwear is seam-taped from the back to prevent water penetration. However, seam tape lacks durability, and water may seep through seams due to deterioration over time.

The UL All-weather series adopts ultrasonic welding, the latest technology that melts and welds the fabrics together by the heat of ultrasonic vibration. This method creates no stitch holes with less damage to the fabric, minimizing the risk of water penetration from the seams due to deterioration with age.

Yamatomichi has teamed up with one of a few craftsmen and factories in Akita Prefecture that are capable of ultrasonic welding and is developing new technologies to make better products.

New technology allows the fabric to be layered and then welded together, making it even more durable, stronger, and waterproof than its predecessor, the UL Rain series.

Most rainwear provides a certain level of heat retention by allowing moisture to build up inside of the garment. However, the UL All-weather series has overwhelming breathability, and the heat generated by the body is always ventilated outside the garment. Keep in mind that you will need to be creative with your layering if you want to focus on keeping warm when resting.

Yamatomichi Journals featured the All-weather Activewear in a series of three articles.

In the first part of a three-part series on rainwear, we will review the technological improvements of waterproof, moisture-permeable fabrics such as Pertex Shield Air, etc. In the second part, we will highlight each fabric through our in-house gear test. And finally, in the last part, we invite Mr. Tomoya Tsuchiya of Hikers Depot and Mr. Kei Kuwahara of “Run boys! Run girls!” to discuss the current situation of rainwear. Don’t miss it!

• Machine wash, gentle at 30°C.
• Use rainwear-specific detergent or a neutral detergent that does not contain bleaching, softening, or brightening agents.
• Wash separately or use a laundry net bag.
• Apply detergent diluted with water and wash with a soft sponge if badly stained. Do not scrub the surface joints or the seam tape on the back.
• If necessary, tumble dry the garment at a upper limit of 60°C to restore water repellency.
• Do not bleach and do not use fabric softener.
• Iron on low. Do not steam.
• Do not dry-clean.
• Vaseline, insect repellent, and ethanol-containing substances such as hair creams, cosmetics and sunscreens may stain the fabric. They may also hinder the water-permeability of the fabric.