An optical fiber comprising: (a) a core having an outer radius r1; (b) a cladding having an outer radius r4 8 microns, in situ modulus EP≤0.35 MPa and a spring constant χP 8 microns, r6≤56 microns. The fiber has a mode field diameter MFD greater than 8.2 microns at 1310 nm; a fiber cutoff wavelength of less than 1310 nm; and a bend loss at a wavelength of 1550 nm, when wrapped around a mandrel having a diameter of 10 mm, of less than 1.0 dB/turn.