The Seiko SSC635 is a men's solar-powered chronograph watch featuring a two-tone stainless steel case and bracelet with black ion finish accents. Powered by any light source, the watch stores up to 6 months of energy reserve using Seiko's Caliber V175 solar quartz movement, eliminating the need for battery replacements.

The 43mm case is protected by a scratch-resistant Hardlex crystal and features a silver-tone dial with luminous black hands and index hour markers. A date display sits between the 4 and 5 o'clock positions. The chronograph function measures elapsed time up to 60 minutes in 1/5-second increments with a split time measurement function. Additional complications include a 24-hour indicator and a GMT/second time zone display.

The two-tone stainless steel bracelet with black ion finish accents is 20mm wide and secured by a fold-over clasp with safety release. The watch is water resistant to 100 meters, making it suitable for swimming and snorkeling.