GIFT E-BOOK: Includes an electronic book. The book contains instructions for use, advantages and benefits of Tech Therapeutics products, tips for long-lasting healthy posture, various gym postural exercises, and dietary and wellness tips. To receive the ebook write us privately through the contact form "CONTACT THE SELLER". IDEAL FOR WORK OR SPORT: This accessory for your back also helps you correct and maintain shoulder and neck posture while working at your home chair or at the office desk with your computer or laptop. You can also use it in daily activities such as driving in your car, exercise at the gym, cooking, daily routines or different types of fitness trainings, workouts and sports, such as running, golf, walking, football or hiking. PAIN RELIEF & COMFORTABLE REALIGNMENT: This postural shoulder and back harness is made from ultra-light, chafing-free neoprene, soft materials, and ergonomic design. It offers thoracic support, correction and comfort without compromising your mobility and without oppression, as well as being more breathable and flexible, so it does not cause irritation, even when worn under clothes. ? WHY OUR POSTURAL CORRECTOR IS DIFFERENT: Thanks to its magnetic therapy solution, this posture trainer improves blood circulation, provides relief and exercises the muscles of the upper back, realigning the vertebrae to achieve a straight posture with the passage of time and frequent use. In addition, it pushes the shoulders back, activating all the muscles. Adjustable back support with high-quality straps is designed to easily fit every body size. UNISEX - DIFFERENT SIZES: It offers several sizes and adjustable lengths with velcro. Size XS-S goes from 27 cm to 40 cm (chest width), size S-M from 30 to 44 cm and size L-XL from 37 to 54 cm. Be sure to measure yourself before selecting your size to ensure optimal fit. ERGONOMIC BACK CORRECTOR: posture corrector that offers a comfortable solution for your back discomfort, helps eliminate hunchback and curvatures of the shoulders so that you achieve the posture you have always wanted, in an adjustable unisex design, suitable for men and women.