The ornamental design for a neck warmer with stowablemask, as shown and described.
FIG. 1 is a front, left isometric view of the neck warmer with stowable mask being worn by a user with the mask being unstowed from its pocket.
FIG. 2 is an elevation isometric view of the neck warmer with stowable mask illustrated with the mask unstowed from its pocket.
FIG. 3 is a front plan view of the neck warmer with stowable mask illustrated with the mask unstowed from its pocket.
FIG. 4 is a top elevation view thereof.
FIG. 5 is a right side elevation view thereof.
FIG. 6 is a left side elevation view thereof.
FIG. 7 is a bottom elevation view thereof; and,
FIG. 8 is a rear plan view thereof.
The lighter stippling shown in the drawings represents a texture on the surface of the claimed design. The darker stippling represents hook-and-loop fastening.
The human head and shoulders shown in FIG. 1 as well as the ear buds and wire device in FIGS. 1-7 shown in longer broken lines represent environmental matter that forms no part of the claimed design. The finely-segmented broken lines illustrate features of the article to which the design is applied that form no part of the claimed design.