The most meaningful design distinction between the JBL Vibe Beam 2 and the JBL Vibe Flex 2 lies in their fit style. The Beam 2 uses an in-ear form factor, meaning the eartip sits inside the ear canal to create a seal, while the Flex 2 adopts an earbud fit, which rests at the entrance of the ear canal without creating that same seal. In practice, in-ear designs typically offer better passive noise isolation and a more secure fit during physical activity, while earbud-style fits tend to feel less fatiguing for extended wear and suit users who prefer a more open, ambient sound experience.
On weight, the difference is negligible: the Beam 2 comes in at 8.6 g versus the Flex 2 at 8.24 g per earbud. A gap of under half a gram is imperceptible during real-world use and should not factor into a buying decision. Both models share an identical IP54 ingress protection rating, meaning they offer equivalent resistance to sweat and light moisture splashes — a reasonable level of protection for workouts and everyday use, though neither is suited for submersion.
All other design attributes — wireless construction, absence of a neckband, no wingtips, no RGB lighting, and no display — are identical across both products. The Beam 2 holds a design edge for users who prioritize noise isolation and a secure fit, while the Flex 2 is the more appropriate choice for those who find in-ear seals uncomfortable or who prefer a more casual, open wearing experience.