--- title: droproof_column | Takanori 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 --- [Skip to content](https://en.droproof.com/column/author/takanori#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/%E3%83%AD%E3%82%B4%E3%83%87%E3%83%BC%E3%82%BFBC.png)](https://en.droproof.com/column/from-outdoor-gear-rental-to-revolutionary-water-repellent-technology-the-story-behind-droproof) [droproof](https://en.droproof.com/column/tag/droproof) ### [From Outdoor Gear Rental to Revolutionary Water Repellent Technology: The Story Behind Droproof](https://en.droproof.com/column/from-outdoor-gear-rental-to-revolutionary-water-repellent-technology-the-story-behind-droproof) September 27, 2025 *How one entrepreneur's frustration with wet rain gear led to the development of a groundbreaking...* [![](https://en.droproof.com/hubfs/GORE-TEX%20A.jpg)](https://en.droproof.com/column/gore-tex-care-understanding-waterproof-breathable-fabrics-and-their-maintenance) [gore-tex](https://en.droproof.com/column/tag/gore-tex) ### [Gore-Tex Care: Understanding Waterproof Breathable Fabrics and Their Maintenance](https://en.droproof.com/column/gore-tex-care-understanding-waterproof-breathable-fabrics-and-their-maintenance) May 6, 2025 ## Introduction: The Gore-Tex Revolution Since the introduction of Gore-Tex, our mountaineering... [![](https://en.droproof.com/hubfs/IMG_1212.jpg)](https://en.droproof.com/column/the-scientific-difference-between-waterproof-and-water-repellent-essential-knowledge-you-might-not-know) [Waterproof](https://en.droproof.com/column/tag/waterproof) ### [The Scientific Difference Between Waterproof and Water-Repellent: Essential Knowledge You Might Not Know](https://en.droproof.com/column/the-scientific-difference-between-waterproof-and-water-repellent-essential-knowledge-you-might-not-know) May 5, 2025 ## Introduction Have you ever wondered about the difference between waterproof and water-repellent... [![](https://en.droproof.com/hubfs/AdobeStock_448532408_Editorial_Use_Only.jpeg)](https://en.droproof.com/column/gore-tex-care-common-mistakes-and-proper-maintenance-methods) [gore-tex](https://en.droproof.com/column/tag/gore-tex) ### [GORE-TEX Care: Common Mistakes and Proper Maintenance Methods](https://en.droproof.com/column/gore-tex-care-common-mistakes-and-proper-maintenance-methods) May 2, 2025 Hello! Today I'd like to talk about the correct care methods for GORE-TEX products that many people... [![](https://en.droproof.com/hubfs/AdobeStock_17319327-1.jpeg)](https://en.droproof.com/column/can-heat-restore-waterproof-performance-the-truth-from-experiments-and-case-studies) [DWR](https://en.droproof.com/column/tag/dwr) ### [Can Heat Restore Waterproof Performance? The Truth from Experiments and Case Studies](https://en.droproof.com/column/can-heat-restore-waterproof-performance-the-truth-from-experiments-and-case-studies) May 1, 2025 Hello outdoor enthusiasts! Today we're going to thoroughly examine the claim that "applying heat to... [![](https://en.droproof.com/hubfs/AdobeStock_456854448-1.jpeg)](https://en.droproof.com/column/rainwear-water-repellency-how-long-does-it-last-analyzing-detailed-data-and-case-studies) [DWR](https://en.droproof.com/column/tag/dwr) ### [Rainwear Water Repellency: How Long Does It Last? ~ Analyzing Detailed Data and Case Studies](https://en.droproof.com/column/rainwear-water-repellency-how-long-does-it-last-analyzing-detailed-data-and-case-studies) April 29, 2025 Hello outdoor enthusiasts! Today, I'll be diving into a question that many of you have probably... [![](https://en.droproof.com/hubfs/AdobeStock_594724909-1.jpeg)](https://en.droproof.com/column/the-current-state-and-challenges-of-pfas-issues-in-japan-understanding-the-forever-chemicals) [PFAS](https://en.droproof.com/column/tag/pfas) ### [The Current State and Challenges of PFAS Issues in Japan: Understanding the "Forever Chemicals"](https://en.droproof.com/column/the-current-state-and-challenges-of-pfas-issues-in-japan-understanding-the-forever-chemicals) April 18, 2025 ## Introduction In recent years, PFAS, known as "forever chemicals," have gained worldwide attention... [![](https://en.droproof.com/hubfs/AdobeStock_293376978-1.jpeg)](https://en.droproof.com/column/7-misconceptions-about-dwr-what-outdoor-enthusiasts-should-know) [gore-tex](https://en.droproof.com/column/tag/gore-tex) ### [7 Misconceptions About DWR - What Outdoor Enthusiasts Should Know](https://en.droproof.com/column/7-misconceptions-about-dwr-what-outdoor-enthusiasts-should-know) April 17, 2025 Hello, today I'd like to talk about DWR (water-repellent treatment), which many people... [![](https://en.droproof.com/hubfs/AdobeStock_28446080-1.jpeg)](https://en.droproof.com/column/which-waterproofing-spray-is-better-fluorinated-silicone-based-or-hydrocarbon-based) [waterproof sprays](https://en.droproof.com/column/tag/waterproof-sprays) ### [Which waterproofing spray is better: fluorinated, silicone-based, or hydrocarbon-based?](https://en.droproof.com/column/which-waterproofing-spray-is-better-fluorinated-silicone-based-or-hydrocarbon-based) November 7, 2024 When choosing a water-repellent spray, there are many different types on the market, including... [![](https://en.droproof.com/hubfs/AdobeStock_491626231-2.jpeg)](https://en.droproof.com/column/what-is-the-problem-with-fluoride-and-what-is-harmful-about-it) [PFCs](https://en.droproof.com/column/tag/pfcs) ### [What is the problem with fluoride, and what is harmful about it?](https://en.droproof.com/column/what-is-the-problem-with-fluoride-and-what-is-harmful-about-it) October 24, 2024 Did you know that recent rainwear is moving away from the use of fluorine? There are fabrics and... [![](https://en.droproof.com/hubfs/GORE-TEX%20A.jpg)](https://en.droproof.com/column/what-is-the-lifespan-of-gore-tex-how-many-years-can-it-be-worn) [gore-tex](https://en.droproof.com/column/tag/gore-tex) ### [What is the lifespan of Gore-Tex? How many years can it be worn?](https://en.droproof.com/column/what-is-the-lifespan-of-gore-tex-how-many-years-can-it-be-worn) October 13, 2024 As an essential part of outdoor wear, Gore-Tex material is indispensable for outdoor enthusiasts... [![](https://en.droproof.com/hubfs/AdobeStock_359539131_Editorial_Use_Only(1).jpeg)](https://en.droproof.com/column/care-of-gore-tex-at-home-proper-use-of-nikwax) [NIKWAX](https://en.droproof.com/column/tag/nikwax) ### [Care of Gore-Tex at home. How you can properly use of NIKWAX](https://en.droproof.com/column/care-of-gore-tex-at-home-proper-use-of-nikwax) September 30, 2024 Outdoor jackets lose their water repellency after use. If water repellency is lost, even... 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