Strap for SUB 300 Carbon Professional

The lug width of the Doxa SUB 300 822.70.351.20 is exactly 20mm. This dimension is specific to this model and corresponds to the distance between the two attachment points on the case. To verify strap compatibility, measure precisely in millimetres between the two lug ends: 20mm is non-negotiable with 18mm or 22mm alternatives.

We recommend African alligator straps for technical elegance, vegetable-tanned calf leather for natural ageing patina, FKM rubber for underwater functionality, or nylon NATO straps for versatility. Your choice depends on intended use: professional diving demands rubber or NATO; daily or formal wear favours alligator or calf. All straps must strictly comply with the 20mm lug width specification.

Obtain two pointed spring bar tools or a dedicated watch strap removal tool. Support the case with one hand and insert the tool point into the gap between lug and strap, pressing gently inward until the spring bar releases. Repeat on the opposite side. Align the new 20mm strap lugs to the case holes, insert from one side and snap the bar until you feel the click of closure. Verify the lug is secure before wearing the watch.

Yes, any aftermarket strap with 20mm lug width is compatible with the Doxa SUB 300 822.70.351.20, provided the lugs are standard spring bar type. Verify material properties: for diving, prioritise robust rubber or nylon; for daily wear, alligator or calf are excellent choices. The quality of the buckle or deployante clasp influences comfort and longevity.

A quality artisanal leather strap—alligator or vegetable-tanned calf—lasts 3–5 years with recreational use and regular maintenance. Constant exposure to saltwater, chlorine and ultraviolet radiation shortens durability to 12–24 months if worn daily for diving. For frequent diving, we recommend FKM rubber straps, which maintain structural integrity beyond 10 years. Leather degrades in humid environments; rubber resists indefinitely if dried and stored away from extreme heat.