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Indoor sunglasses are lightly tinted glasses designed to reduce glare and eye strain from indoor light without making spaces look dark.

J-shaped jeans are curved-leg denim with a swooping side seam that adds hip volume and stacks neatly around the ankle.

Interval training workouts mix harder exercise bursts with easier recovery periods to build cardio fitness, burn calories, and save workout time.

Ironic T-shirts use words or images that clash with reality to create dry, self-aware humor on a daily garment.

Intra-workout supplements are drinks or powders taken during training to supply quick fuel, fluids, and electrolytes.

Jamie jeans are Topshop high-rise skinny stretch denim jeans that hug from waist to ankle with a power-hold fit.

Traditional Japanese jackets are mainly known as haori, hanten, happi, noragi, jinbei tops, samue jackets, and modern sukajan.

J bars are small foam inserts that lock your heel in place inside snowboard boots to cut down heel lift and ankle rub.

Inflatable life jackets use a tough fabric shell, a coated air bladder, and a CO2 system built from metal and plastic parts.