Who is the JB’s Inner Jacket 3INJ Best Suited For? The JB’s Inner Jacket 3INJ is perfect for anyone seeking a combination of warmth, style, and practicality. Whether you're commuting in the city, heading to work, or enjoying casual outings, this jacket is designed for the modern individual who values both function and fashion. Ideal for urban professionals, students, and anyone on the go, the 3INJ provides the ultimate in comfort and versatility.