--- title: droproof_column | Takanori (3) description: Born in 1980. After graduating from university, he joined Daikin Industries, one of only two fluorine manufacturers in Japan. He was involved in development work as an engineer. In 2010, he started Outdoor Gear Rental Soronoshita as a sole proprietorship and became the first in Japan to start renting outdoor equipment, mainly for mountain climbing, over the Internet. In 2012, he established Soronoshita Co. He is the current president of Soronoshita. Certified Mountaineering Guide Stage II & Nature Guide Stage I by the Japan Mountain Guides Association. Camping Instructor, Japan Camping Association; Camping Instructor, Japan Auto Camping Association; Cleaning person; High-pressure gas production safety officer (3) --- [Skip to content](https://en.droproof.com/column/author/takanori/page/3#main-content) - [English](https://en.droproof.com/column/author/takanori) - [Deutsch](https://en.droproof.com/de/column/author/takanori) - [한국어 - 대한민국](https://en.droproof.com/ko-kr/column/author/takanori) - [中文 - 繁體](https://en.droproof.com/zh-tw/column/author/takanori) - [简体中文](https://en.droproof.com/zh-cn/column/author/takanori) English Show submenu for translations [![ロゴデータBB](https://en.droproof.com/hs-fs/hubfs/%E3%83%AD%E3%82%B4%E3%83%87%E3%83%BC%E3%82%BFBB.png?width=283&height=114&name=%E3%83%AD%E3%82%B4%E3%83%87%E3%83%BC%E3%82%BFBB.png)](https://en.droproof.com/?hsLang=en) - [HOME](https://en.droproof.com) Show submenu for HOME - [What do we want?](https://en.droproof.com/de/what-do-we-want-to-solve) - [Why can we do it?](https://en.droproof.com/why-can-we-do-it) - [How well does it?](https://en.droproof.com/how-well-does-it-perform-dwr) - [Contact us](https://en.droproof.com/contact-us) - [Cross talk](https://en.droproof.com/cross_talk) - [Column](https://en.droproof.com/column) - [Privacy policy](https://en.droproof.com/privacypollicy) Open main navigation Close main navigation - [HOME](https://en.droproof.com) Show submenu for HOME - [What do we want?](https://en.droproof.com/de/what-do-we-want-to-solve) - [Why can we do it?](https://en.droproof.com/why-can-we-do-it) - [How well does it?](https://en.droproof.com/how-well-does-it-perform-dwr) - [Contact us](https://en.droproof.com/contact-us) - [Cross talk](https://en.droproof.com/cross_talk) - [Column](https://en.droproof.com/column) - [Privacy policy](https://en.droproof.com/privacypollicy) - - [English](https://en.droproof.com/column/author/takanori) - [Deutsch](https://en.droproof.com/de/column/author/takanori) - [한국어 - 대한민국](https://en.droproof.com/ko-kr/column/author/takanori) - [中文 - 繁體](https://en.droproof.com/zh-tw/column/author/takanori) - [简体中文](https://en.droproof.com/zh-cn/column/author/takanori) English Show submenu for translations - [Contact us](https://en.droproof.com/contact-us) [Contact us](https://en.droproof.com/contact-us?hsLang=en) # List of all columns in droproof We offer DWR revitalization and other outdoor sustainable solutions services. This section provides information about outdoor equipment maintenance. [![](https://en.droproof.com/hubfs/AdobeStock_16893001-1.jpeg)](https://en.droproof.com/column/appropriate-measures-are-in-place-to-address-factors-that-reduce-water-repellency) [DWR](https://en.droproof.com/column/tag/dwr) ### [Appropriate measures are in place to address factors that reduce water repellency](https://en.droproof.com/column/appropriate-measures-are-in-place-to-address-factors-that-reduce-water-repellency) June 26, 2024 In the previous article, I wrote about three factors that reduce water repellency, and in this... [![](https://en.droproof.com/hubfs/AdobeStock_63545889.jpeg)](https://en.droproof.com/column/factors-that-decrease-water-repellency-of-rain-jackets) [DWR](https://en.droproof.com/column/tag/dwr) ### [Factors that Decrease Water Repellency of Rain Jackets](https://en.droproof.com/column/factors-that-decrease-water-repellency-of-rain-jackets) June 20, 2024 We stated in a previous article that rain jackets do not lose their water repellency if they are... [![](https://en.droproof.com/hubfs/AdobeStock_16893001.jpeg)](https://en.droproof.com/column/how-long-can-water-repellency-of-rainwear-last) [DWR](https://en.droproof.com/column/tag/dwr) ### [How long can water repellency of rainwear last?](https://en.droproof.com/column/how-long-can-water-repellency-of-rainwear-last) June 12, 2024 We already offer DWR treatment services in Japan.The most frequently asked question is "How long... [![](https://en.droproof.com/hubfs/AdobeStock_491626231-1.jpeg)](https://en.droproof.com/column/pfas-free-rain-jackets.-whats-the-problem) [DWR](https://en.droproof.com/column/tag/dwr) ### [PFAS-free rain jackets. What's the problem?](https://en.droproof.com/column/pfas-free-rain-jackets.-whats-the-problem) June 4, 2024 Did you know that rain jackets are now switching to PFAS-free? Here we will explain the advantages... [![What is PFC-free in rain jacket](https://en.droproof.com/hubfs/vol%2002%20thumbnail.jpg)](https://en.droproof.com/column/what-is-a-pfc-free-in-rain-jacket) [DWR](https://en.droproof.com/column/tag/dwr) ### [What is PFC-free in rain jacket](https://en.droproof.com/column/what-is-a-pfc-free-in-rain-jacket) May 25, 2024 ## What is PFC-free/PFAS-free in Rain jacket? [![](https://en.droproof.com/hubfs/AdobeStock_567310646.jpeg)](https://en.droproof.com/column/misconception-that-water-resistance-decreases-over-time) [DWR](https://en.droproof.com/column/tag/dwr) ### [Misconception that water resistance decreases over time.](https://en.droproof.com/column/misconception-that-water-resistance-decreases-over-time) May 25, 2024 For those of you who have purchased expensive outdoor jackets, such as Gore-Tex jackets, and have... [![](https://en.droproof.com/hubfs/20230903_144500-2.jpg)](https://en.droproof.com/column/for-those-who-are-not-satisfied-with-dwr-using-waterproof-sprays-or-commercial-water-repellents) [DWR](https://en.droproof.com/column/tag/dwr) ### [Are you satisfied with DWR using waterproof sprays or commercial water repellents?](https://en.droproof.com/column/for-those-who-are-not-satisfied-with-dwr-using-waterproof-sprays-or-commercial-water-repellents) May 21, 2024 For those of you who have purchased expensive outdoor jackets such as Gore-Tex jackets and have had... [![heat restore](https://en.droproof.com/hubfs/AdobeStock_69850861(1).jpeg)](https://en.droproof.com/column/will-applying-heat-restore-waterproofing-performance) [DWR](https://en.droproof.com/column/tag/dwr) ### [Applying heat restore waterproofing performance?](https://en.droproof.com/column/will-applying-heat-restore-waterproofing-performance) May 16, 2024 You may have heard that when water is no longer repelled by umbrellas or rainwear, it can be... [![PFAS FREE](https://en.droproof.com/hubfs/AdobeStock_673699051.jpeg)](https://en.droproof.com/column/what-has-changed-with-pfc-free-fluorine-free-or-c0-water-repellent) [PFCs](https://en.droproof.com/column/tag/pfcs) ### [Changes of PFC-free (fluorine-free or C0 water repellent)?](https://en.droproof.com/column/what-has-changed-with-pfc-free-fluorine-free-or-c0-water-repellent) May 8, 2024 Did you know that the water repellents used in outdoor clothing are changing now? Rain jackets that... [![](https://en.droproof.com/hubfs/AdobeStock_63545889.jpeg)](https://en.droproof.com/column/common-mistakes-problems-with-gore-tex-laundering) [gore-tex](https://en.droproof.com/column/tag/gore-tex) ### [Common misunderstandings with Gore-Tex laundering](https://en.droproof.com/column/common-mistakes-problems-with-gore-tex-laundering) May 1, 2024 Washing instructions for Gore-Tex are available on the Gore-Tex website and on each manufacturer's... [![](https://en.droproof.com/hubfs/AdobeStock_594724909.jpeg)](https://en.droproof.com/column/is-it-wrong-to-say-that-fluorine-is-harmful-pfas-and-inorganic-fluorine-compounds-are-different) [PFCs](https://en.droproof.com/column/tag/pfcs) ### [Is it wrong to say that fluorine is harmful? PFAS and inorganic fluorine compounds are different](https://en.droproof.com/column/is-it-wrong-to-say-that-fluorine-is-harmful-pfas-and-inorganic-fluorine-compounds-are-different) April 22, 2024 We in the outdoor industry are in the process of switching to non-fluoride materials and water... [![](https://en.droproof.com/hubfs/AdobeStock_16741486(1)-1.jpeg)](https://en.droproof.com/column/advantages-and-disadvantages-of-waterproof-breathable-fabrics-like-gore-tex) [DWR](https://en.droproof.com/column/tag/dwr) ### [Advantages and disadvantages of waterproof breathable fabrics like Gore-Tex](https://en.droproof.com/column/advantages-and-disadvantages-of-waterproof-breathable-fabrics-like-gore-tex) April 16, 2024 ## Gore-Tex is so great! Since the introduction of Gore-Tex, our mountaineering activities have become... 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